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Finding the Fourth Proportional to 120,864.60, 181,491.30 and 87,816.60

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Solution

The fourth proportional to 120,864.60, 181,491.30 and 87,816.60 is: 131,866.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,864.60 : 181,491.30 = 87,816.60 : x
  2. Step 2: Convert to fraction form
    120,864.60/181,491.30 = 87,816.60/x
  3. Step 3: Cross multiply
    120,864.60x = 181,491.30 × 87,816.60
  4. Step 4: Simplify right side
    120,864.60x = 15,937,948,895.58
  5. Step 5: Solve for x
    x = 15,937,948,895.58/120,864.60
  6. Step 6: Final answer
    x = 131,866.15

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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.