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Finding the Fourth Proportional to 85,856.64, 128,607.68 and 63,695.04

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Solution

The fourth proportional to 85,856.64, 128,607.68 and 63,695.04 is: 95,411.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,856.64 : 128,607.68 = 63,695.04 : x
  2. Step 2: Convert to fraction form
    85,856.64/128,607.68 = 63,695.04/x
  3. Step 3: Cross multiply
    85,856.64x = 128,607.68 × 63,695.04
  4. Step 4: Simplify right side
    85,856.64x = 8,191,671,321.91
  5. Step 5: Solve for x
    x = 8,191,671,321.91/85,856.64
  6. Step 6: Final answer
    x = 95,411.04

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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.