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Finding the Fourth Proportional to 873.24, 1,205.64 and 542.15

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Solution

The fourth proportional to 873.24, 1,205.64 and 542.15 is: 748.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.24 : 1,205.64 = 542.15 : x
  2. Step 2: Convert to fraction form
    873.24/1,205.64 = 542.15/x
  3. Step 3: Cross multiply
    873.24x = 1,205.64 × 542.15
  4. Step 4: Simplify right side
    873.24x = 653,640.74
  5. Step 5: Solve for x
    x = 653,640.74/873.24
  6. Step 6: Final answer
    x = 748.52

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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.