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Finding the Fourth Proportional to 102,639.80, 153,815.70 and 81,615.80

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Solution

The fourth proportional to 102,639.80, 153,815.70 and 81,615.80 is: 122,309.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,639.80 : 153,815.70 = 81,615.80 : x
  2. Step 2: Convert to fraction form
    102,639.80/153,815.70 = 81,615.80/x
  3. Step 3: Cross multiply
    102,639.80x = 153,815.70 × 81,615.80
  4. Step 4: Simplify right side
    102,639.80x = 12,553,791,408.06
  5. Step 5: Solve for x
    x = 12,553,791,408.06/102,639.80
  6. Step 6: Final answer
    x = 122,309.20

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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.