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Finding the Fourth Proportional to 545.72, 753.47 and 421.17

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Solution

The fourth proportional to 545.72, 753.47 and 421.17 is: 581.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.72 : 753.47 = 421.17 : x
  2. Step 2: Convert to fraction form
    545.72/753.47 = 421.17/x
  3. Step 3: Cross multiply
    545.72x = 753.47 × 421.17
  4. Step 4: Simplify right side
    545.72x = 317,336.85
  5. Step 5: Solve for x
    x = 317,336.85/545.72
  6. Step 6: Final answer
    x = 581.51

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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.