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Finding the Fourth Proportional to 915.34, 1,263.12 and 542.32

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Solution

The fourth proportional to 915.34, 1,263.12 and 542.32 is: 748.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.34 : 1,263.12 = 542.32 : x
  2. Step 2: Convert to fraction form
    915.34/1,263.12 = 542.32/x
  3. Step 3: Cross multiply
    915.34x = 1,263.12 × 542.32
  4. Step 4: Simplify right side
    915.34x = 685,015.24
  5. Step 5: Solve for x
    x = 685,015.24/915.34
  6. Step 6: Final answer
    x = 748.37

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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.