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Finding the Fourth Proportional to 171,864.60, 257,890.86 and 66,687.72

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Solution

The fourth proportional to 171,864.60, 257,890.86 and 66,687.72 is: 100,068.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,864.60 : 257,890.86 = 66,687.72 : x
  2. Step 2: Convert to fraction form
    171,864.60/257,890.86 = 66,687.72/x
  3. Step 3: Cross multiply
    171,864.60x = 257,890.86 × 66,687.72
  4. Step 4: Simplify right side
    171,864.60x = 17,198,153,462.24
  5. Step 5: Solve for x
    x = 17,198,153,462.24/171,864.60
  6. Step 6: Final answer
    x = 100,068.04

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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.