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Finding the Fourth Proportional to 642.47, 961.04 and 545.06

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Solution

The fourth proportional to 642.47, 961.04 and 545.06 is: 815.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.47 : 961.04 = 545.06 : x
  2. Step 2: Convert to fraction form
    642.47/961.04 = 545.06/x
  3. Step 3: Cross multiply
    642.47x = 961.04 × 545.06
  4. Step 4: Simplify right side
    642.47x = 523,828.23
  5. Step 5: Solve for x
    x = 523,828.23/642.47
  6. Step 6: Final answer
    x = 815.34

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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.