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Finding the Fourth Proportional to 85,956.61, 128,917.86 and 43,250.65

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Solution

The fourth proportional to 85,956.61, 128,917.86 and 43,250.65 is: 64,867.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,956.61 : 128,917.86 = 43,250.65 : x
  2. Step 2: Convert to fraction form
    85,956.61/128,917.86 = 43,250.65/x
  3. Step 3: Cross multiply
    85,956.61x = 128,917.86 × 43,250.65
  4. Step 4: Simplify right side
    85,956.61x = 5,575,781,482.29
  5. Step 5: Solve for x
    x = 5,575,781,482.29/85,956.61
  6. Step 6: Final answer
    x = 64,867.40

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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.