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Finding the Fourth Proportional to 555.18, 765.98 and 387.13

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Solution

The fourth proportional to 555.18, 765.98 and 387.13 is: 534.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.18 : 765.98 = 387.13 : x
  2. Step 2: Convert to fraction form
    555.18/765.98 = 387.13/x
  3. Step 3: Cross multiply
    555.18x = 765.98 × 387.13
  4. Step 4: Simplify right side
    555.18x = 296,533.96
  5. Step 5: Solve for x
    x = 296,533.96/555.18
  6. Step 6: Final answer
    x = 534.12

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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.