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Finding the Fourth Proportional to 555, 766.80 and 500.40

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Solution

The fourth proportional to 555, 766.80 and 500.40 is: 691.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    555 : 766.80 = 500.40 : x
  2. Step 2: Convert to fraction form
    555/766.80 = 500.40/x
  3. Step 3: Cross multiply
    555x = 766.80 × 500.40
  4. Step 4: Simplify right side
    555x = 383,706.72
  5. Step 5: Solve for x
    x = 383,706.72/555
  6. Step 6: Final answer
    x = 691.36

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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.