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Finding the Fourth Proportional to 671.60, 1,000.36 and 640.02

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Solution

The fourth proportional to 671.60, 1,000.36 and 640.02 is: 953.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.60 : 1,000.36 = 640.02 : x
  2. Step 2: Convert to fraction form
    671.60/1,000.36 = 640.02/x
  3. Step 3: Cross multiply
    671.60x = 1,000.36 × 640.02
  4. Step 4: Simplify right side
    671.60x = 640,250.41
  5. Step 5: Solve for x
    x = 640,250.41/671.60
  6. Step 6: Final answer
    x = 953.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.