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Finding the Fourth Proportional to 7,123.88, 9,830.04 and 3,980.20

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Solution

The fourth proportional to 7,123.88, 9,830.04 and 3,980.20 is: 5,492.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,123.88 : 9,830.04 = 3,980.20 : x
  2. Step 2: Convert to fraction form
    7,123.88/9,830.04 = 3,980.20/x
  3. Step 3: Cross multiply
    7,123.88x = 9,830.04 × 3,980.20
  4. Step 4: Simplify right side
    7,123.88x = 39,125,525.21
  5. Step 5: Solve for x
    x = 39,125,525.21/7,123.88
  6. Step 6: Final answer
    x = 5,492.17

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.