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Finding the Fourth Proportional to 830.88, 1,145.52 and 665.28

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Solution

The fourth proportional to 830.88, 1,145.52 and 665.28 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.88 : 1,145.52 = 665.28 : x
  2. Step 2: Convert to fraction form
    830.88/1,145.52 = 665.28/x
  3. Step 3: Cross multiply
    830.88x = 1,145.52 × 665.28
  4. Step 4: Simplify right side
    830.88x = 762,091.55
  5. Step 5: Solve for x
    x = 762,091.55/830.88
  6. Step 6: Final answer
    x = 917.21

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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.