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Finding the Fourth Proportional to 121,870.70, 182,449.65 and 86,878.70

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Solution

The fourth proportional to 121,870.70, 182,449.65 and 86,878.70 is: 130,063.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,870.70 : 182,449.65 = 86,878.70 : x
  2. Step 2: Convert to fraction form
    121,870.70/182,449.65 = 86,878.70/x
  3. Step 3: Cross multiply
    121,870.70x = 182,449.65 × 86,878.70
  4. Step 4: Simplify right side
    121,870.70x = 15,850,988,407.46
  5. Step 5: Solve for x
    x = 15,850,988,407.46/121,870.70
  6. Step 6: Final answer
    x = 130,063.98

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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.