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Finding the Fourth Proportional to 701.60, 1,052.40 and 642.20

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Solution

The fourth proportional to 701.60, 1,052.40 and 642.20 is: 963.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    701.60 : 1,052.40 = 642.20 : x
  2. Step 2: Convert to fraction form
    701.60/1,052.40 = 642.20/x
  3. Step 3: Cross multiply
    701.60x = 1,052.40 × 642.20
  4. Step 4: Simplify right side
    701.60x = 675,851.28
  5. Step 5: Solve for x
    x = 675,851.28/701.60
  6. Step 6: Final answer
    x = 963.30

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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.