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Finding the Fourth Proportional to 917.49, 1,372.78 and 545.92

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Solution

The fourth proportional to 917.49, 1,372.78 and 545.92 is: 816.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.49 : 1,372.78 = 545.92 : x
  2. Step 2: Convert to fraction form
    917.49/1,372.78 = 545.92/x
  3. Step 3: Cross multiply
    917.49x = 1,372.78 × 545.92
  4. Step 4: Simplify right side
    917.49x = 749,430.81
  5. Step 5: Solve for x
    x = 749,430.81/917.49
  6. Step 6: Final answer
    x = 816.83

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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.