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Finding the Fourth Proportional to 104,885.70, 156,982.95 and 81,384.90

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Solution

The fourth proportional to 104,885.70, 156,982.95 and 81,384.90 is: 121,809.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,885.70 : 156,982.95 = 81,384.90 : x
  2. Step 2: Convert to fraction form
    104,885.70/156,982.95 = 81,384.90/x
  3. Step 3: Cross multiply
    104,885.70x = 156,982.95 × 81,384.90
  4. Step 4: Simplify right side
    104,885.70x = 12,776,041,687.46
  5. Step 5: Solve for x
    x = 12,776,041,687.46/104,885.70
  6. Step 6: Final answer
    x = 121,809.19

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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.