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Finding the Fourth Proportional to 917.96, 1,266.79 and 545.13

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Solution

The fourth proportional to 917.96, 1,266.79 and 545.13 is: 752.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.96 : 1,266.79 = 545.13 : x
  2. Step 2: Convert to fraction form
    917.96/1,266.79 = 545.13/x
  3. Step 3: Cross multiply
    917.96x = 1,266.79 × 545.13
  4. Step 4: Simplify right side
    917.96x = 690,557.54
  5. Step 5: Solve for x
    x = 690,557.54/917.96
  6. Step 6: Final answer
    x = 752.27

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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.