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Finding the Fourth Proportional to 807.38, 1,113.78 and 512.13

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Solution

The fourth proportional to 807.38, 1,113.78 and 512.13 is: 706.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.38 : 1,113.78 = 512.13 : x
  2. Step 2: Convert to fraction form
    807.38/1,113.78 = 512.13/x
  3. Step 3: Cross multiply
    807.38x = 1,113.78 × 512.13
  4. Step 4: Simplify right side
    807.38x = 570,400.15
  5. Step 5: Solve for x
    x = 570,400.15/807.38
  6. Step 6: Final answer
    x = 706.48

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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.