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Finding the Fourth Proportional to 68,239.55, 102,341.10 and 20,854.55

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Solution

The fourth proportional to 68,239.55, 102,341.10 and 20,854.55 is: 31,276.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,239.55 : 102,341.10 = 20,854.55 : x
  2. Step 2: Convert to fraction form
    68,239.55/102,341.10 = 20,854.55/x
  3. Step 3: Cross multiply
    68,239.55x = 102,341.10 × 20,854.55
  4. Step 4: Simplify right side
    68,239.55x = 2,134,277,587.01
  5. Step 5: Solve for x
    x = 2,134,277,587.01/68,239.55
  6. Step 6: Final answer
    x = 31,276.26

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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.