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Finding the Fourth Proportional to 736.18, 1,017.21 and 642.58

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Solution

The fourth proportional to 736.18, 1,017.21 and 642.58 is: 887.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.18 : 1,017.21 = 642.58 : x
  2. Step 2: Convert to fraction form
    736.18/1,017.21 = 642.58/x
  3. Step 3: Cross multiply
    736.18x = 1,017.21 × 642.58
  4. Step 4: Simplify right side
    736.18x = 653,638.80
  5. Step 5: Solve for x
    x = 653,638.80/736.18
  6. Step 6: Final answer
    x = 887.88

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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.