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Finding the Fourth Proportional to 545.16, 751.30 and 387.79

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Solution

The fourth proportional to 545.16, 751.30 and 387.79 is: 534.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.16 : 751.30 = 387.79 : x
  2. Step 2: Convert to fraction form
    545.16/751.30 = 387.79/x
  3. Step 3: Cross multiply
    545.16x = 751.30 × 387.79
  4. Step 4: Simplify right side
    545.16x = 291,346.63
  5. Step 5: Solve for x
    x = 291,346.63/545.16
  6. Step 6: Final answer
    x = 534.42

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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.