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Finding the Fourth Proportional to 816.71, 1,126.54 and 555.17

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Solution

The fourth proportional to 816.71, 1,126.54 and 555.17 is: 765.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.71 : 1,126.54 = 555.17 : x
  2. Step 2: Convert to fraction form
    816.71/1,126.54 = 555.17/x
  3. Step 3: Cross multiply
    816.71x = 1,126.54 × 555.17
  4. Step 4: Simplify right side
    816.71x = 625,421.21
  5. Step 5: Solve for x
    x = 625,421.21/816.71
  6. Step 6: Final answer
    x = 765.78

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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.