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Finding the Fourth Proportional to 555.68, 767.08 and 520.70

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Solution

The fourth proportional to 555.68, 767.08 and 520.70 is: 718.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.68 : 767.08 = 520.70 : x
  2. Step 2: Convert to fraction form
    555.68/767.08 = 520.70/x
  3. Step 3: Cross multiply
    555.68x = 767.08 × 520.70
  4. Step 4: Simplify right side
    555.68x = 399,418.25
  5. Step 5: Solve for x
    x = 399,418.25/555.68
  6. Step 6: Final answer
    x = 718.79

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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.