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Finding the Fourth Proportional to 86,486.46, 129,443.85 and 78,714.78

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Solution

The fourth proportional to 86,486.46, 129,443.85 and 78,714.78 is: 117,812.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,486.46 : 129,443.85 = 78,714.78 : x
  2. Step 2: Convert to fraction form
    86,486.46/129,443.85 = 78,714.78/x
  3. Step 3: Cross multiply
    86,486.46x = 129,443.85 × 78,714.78
  4. Step 4: Simplify right side
    86,486.46x = 10,189,144,175.10
  5. Step 5: Solve for x
    x = 10,189,144,175.10/86,486.46
  6. Step 6: Final answer
    x = 117,812.02

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1.5x scale

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.