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Finding the Fourth Proportional to 137,021.40, 205,877.70 and 87,125.40

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Solution

The fourth proportional to 137,021.40, 205,877.70 and 87,125.40 is: 130,907.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,021.40 : 205,877.70 = 87,125.40 : x
  2. Step 2: Convert to fraction form
    137,021.40/205,877.70 = 87,125.40/x
  3. Step 3: Cross multiply
    137,021.40x = 205,877.70 × 87,125.40
  4. Step 4: Simplify right side
    137,021.40x = 17,937,176,963.58
  5. Step 5: Solve for x
    x = 17,937,176,963.58/137,021.40
  6. Step 6: Final answer
    x = 130,907.85

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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.