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Finding the Fourth Proportional to 1,225.80, 1,689.84 and 914.76

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Solution

The fourth proportional to 1,225.80, 1,689.84 and 914.76 is: 1,261.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.80 : 1,689.84 = 914.76 : x
  2. Step 2: Convert to fraction form
    1,225.80/1,689.84 = 914.76/x
  3. Step 3: Cross multiply
    1,225.80x = 1,689.84 × 914.76
  4. Step 4: Simplify right side
    1,225.80x = 1,545,798.04
  5. Step 5: Solve for x
    x = 1,545,798.04/1,225.80
  6. Step 6: Final answer
    x = 1,261.05

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Half scale
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Double scale
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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.