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Finding the Fourth Proportional to 104,869.70, 156,958.95 and 81,368.90

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Solution

The fourth proportional to 104,869.70, 156,958.95 and 81,368.90 is: 121,785.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,869.70 : 156,958.95 = 81,368.90 : x
  2. Step 2: Convert to fraction form
    104,869.70/156,958.95 = 81,368.90/x
  3. Step 3: Cross multiply
    104,869.70x = 156,958.95 × 81,368.90
  4. Step 4: Simplify right side
    104,869.70x = 12,771,577,106.66
  5. Step 5: Solve for x
    x = 12,771,577,106.66/104,869.70
  6. Step 6: Final answer
    x = 121,785.20

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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.