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Finding the Fourth Proportional to 172,646.98, 258,685.32 and 78,946.18

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Solution

The fourth proportional to 172,646.98, 258,685.32 and 78,946.18 is: 118,288.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,646.98 : 258,685.32 = 78,946.18 : x
  2. Step 2: Convert to fraction form
    172,646.98/258,685.32 = 78,946.18/x
  3. Step 3: Cross multiply
    172,646.98x = 258,685.32 × 78,946.18
  4. Step 4: Simplify right side
    172,646.98x = 20,422,217,836.08
  5. Step 5: Solve for x
    x = 20,422,217,836.08/172,646.98
  6. Step 6: Final answer
    x = 118,288.88

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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.