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Finding the Fourth Proportional to 85,956.10, 128,934.15 and 84,643.90

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Solution

The fourth proportional to 85,956.10, 128,934.15 and 84,643.90 is: 126,965.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,956.10 : 128,934.15 = 84,643.90 : x
  2. Step 2: Convert to fraction form
    85,956.10/128,934.15 = 84,643.90/x
  3. Step 3: Cross multiply
    85,956.10x = 128,934.15 × 84,643.90
  4. Step 4: Simplify right side
    85,956.10x = 10,913,489,299.19
  5. Step 5: Solve for x
    x = 10,913,489,299.19/85,956.10
  6. Step 6: Final answer
    x = 126,965.85

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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.