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Finding the Fourth Proportional to 545.52, 816.69 and 407.31

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Solution

The fourth proportional to 545.52, 816.69 and 407.31 is: 609.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.52 : 816.69 = 407.31 : x
  2. Step 2: Convert to fraction form
    545.52/816.69 = 407.31/x
  3. Step 3: Cross multiply
    545.52x = 816.69 × 407.31
  4. Step 4: Simplify right side
    545.52x = 332,646.00
  5. Step 5: Solve for x
    x = 332,646.00/545.52
  6. Step 6: Final answer
    x = 609.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.