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Finding the Fourth Proportional to 102,713.80, 153,926.70 and 81,689.80

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Solution

The fourth proportional to 102,713.80, 153,926.70 and 81,689.80 is: 122,420.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,713.80 : 153,926.70 = 81,689.80 : x
  2. Step 2: Convert to fraction form
    102,713.80/153,926.70 = 81,689.80/x
  3. Step 3: Cross multiply
    102,713.80x = 153,926.70 × 81,689.80
  4. Step 4: Simplify right side
    102,713.80x = 12,574,241,337.66
  5. Step 5: Solve for x
    x = 12,574,241,337.66/102,713.80
  6. Step 6: Final answer
    x = 122,420.17

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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.