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Finding the Fourth Proportional to 85,972.80, 129,056.40 and 66,338.40

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Solution

The fourth proportional to 85,972.80, 129,056.40 and 66,338.40 is: 99,582.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,972.80 : 129,056.40 = 66,338.40 : x
  2. Step 2: Convert to fraction form
    85,972.80/129,056.40 = 66,338.40/x
  3. Step 3: Cross multiply
    85,972.80x = 129,056.40 × 66,338.40
  4. Step 4: Simplify right side
    85,972.80x = 8,561,395,085.76
  5. Step 5: Solve for x
    x = 8,561,395,085.76/85,972.80
  6. Step 6: Final answer
    x = 99,582.60

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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.