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Finding the Fourth Proportional to 545.72, 753.09 and 312.85

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Solution

The fourth proportional to 545.72, 753.09 and 312.85 is: 431.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.72 : 753.09 = 312.85 : x
  2. Step 2: Convert to fraction form
    545.72/753.09 = 312.85/x
  3. Step 3: Cross multiply
    545.72x = 753.09 × 312.85
  4. Step 4: Simplify right side
    545.72x = 235,604.21
  5. Step 5: Solve for x
    x = 235,604.21/545.72
  6. Step 6: Final answer
    x = 431.73

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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.