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Finding the Fourth Proportional to 86,642.64, 129,925.08 and 39,870

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Solution

The fourth proportional to 86,642.64, 129,925.08 and 39,870 is: 59,787.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,642.64 : 129,925.08 = 39,870 : x
  2. Step 2: Convert to fraction form
    86,642.64/129,925.08 = 39,870/x
  3. Step 3: Cross multiply
    86,642.64x = 129,925.08 × 39,870
  4. Step 4: Simplify right side
    86,642.64x = 5,180,112,939.60
  5. Step 5: Solve for x
    x = 5,180,112,939.60/86,642.64
  6. Step 6: Final answer
    x = 59,787.11

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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.