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Finding the Fourth Proportional to 1,373.44, 2,059.50 and 642.40

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Solution

The fourth proportional to 1,373.44, 2,059.50 and 642.40 is: 963.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.44 : 2,059.50 = 642.40 : x
  2. Step 2: Convert to fraction form
    1,373.44/2,059.50 = 642.40/x
  3. Step 3: Cross multiply
    1,373.44x = 2,059.50 × 642.40
  4. Step 4: Simplify right side
    1,373.44x = 1,323,022.80
  5. Step 5: Solve for x
    x = 1,323,022.80/1,373.44
  6. Step 6: Final answer
    x = 963.29

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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.