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Finding the Fourth Proportional to 458,072.70, 687,173.85 and 142,496.70

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Solution

The fourth proportional to 458,072.70, 687,173.85 and 142,496.70 is: 213,765.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,072.70 : 687,173.85 = 142,496.70 : x
  2. Step 2: Convert to fraction form
    458,072.70/687,173.85 = 142,496.70/x
  3. Step 3: Cross multiply
    458,072.70x = 687,173.85 × 142,496.70
  4. Step 4: Simplify right side
    458,072.70x = 97,920,005,951.30
  5. Step 5: Solve for x
    x = 97,920,005,951.30/458,072.70
  6. Step 6: Final answer
    x = 213,765.21

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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.