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Finding the Fourth Proportional to 137,025.40, 205,883.70 and 87,129.40

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Solution

The fourth proportional to 137,025.40, 205,883.70 and 87,129.40 is: 130,913.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,025.40 : 205,883.70 = 87,129.40 : x
  2. Step 2: Convert to fraction form
    137,025.40/205,883.70 = 87,129.40/x
  3. Step 3: Cross multiply
    137,025.40x = 205,883.70 × 87,129.40
  4. Step 4: Simplify right side
    137,025.40x = 17,938,523,250.78
  5. Step 5: Solve for x
    x = 17,938,523,250.78/137,025.40
  6. Step 6: Final answer
    x = 130,913.85

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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.