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Finding the Fourth Proportional to 762.48, 1,141.20 and 545.40

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Solution

The fourth proportional to 762.48, 1,141.20 and 545.40 is: 816.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.48 : 1,141.20 = 545.40 : x
  2. Step 2: Convert to fraction form
    762.48/1,141.20 = 545.40/x
  3. Step 3: Cross multiply
    762.48x = 1,141.20 × 545.40
  4. Step 4: Simplify right side
    762.48x = 622,410.48
  5. Step 5: Solve for x
    x = 622,410.48/762.48
  6. Step 6: Final answer
    x = 816.30

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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.