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Finding the Fourth Proportional to 125,985.20, 188,718.60 and 86,586.80

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Solution

The fourth proportional to 125,985.20, 188,718.60 and 86,586.80 is: 129,702.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,985.20 : 188,718.60 = 86,586.80 : x
  2. Step 2: Convert to fraction form
    125,985.20/188,718.60 = 86,586.80/x
  3. Step 3: Cross multiply
    125,985.20x = 188,718.60 × 86,586.80
  4. Step 4: Simplify right side
    125,985.20x = 16,340,539,674.48
  5. Step 5: Solve for x
    x = 16,340,539,674.48/125,985.20
  6. Step 6: Final answer
    x = 129,702.06

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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.