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Finding the Fourth Proportional to 545.11, 751.76 and 428.47

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Solution

The fourth proportional to 545.11, 751.76 and 428.47 is: 590.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.11 : 751.76 = 428.47 : x
  2. Step 2: Convert to fraction form
    545.11/751.76 = 428.47/x
  3. Step 3: Cross multiply
    545.11x = 751.76 × 428.47
  4. Step 4: Simplify right side
    545.11x = 322,106.61
  5. Step 5: Solve for x
    x = 322,106.61/545.11
  6. Step 6: Final answer
    x = 590.90

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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.