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Finding the Fourth Proportional to 485,900.47, 728,990.70 and 148,990.76

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Solution

The fourth proportional to 485,900.47, 728,990.70 and 148,990.76 is: 223,529.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,900.47 : 728,990.70 = 148,990.76 : x
  2. Step 2: Convert to fraction form
    485,900.47/728,990.70 = 148,990.76/x
  3. Step 3: Cross multiply
    485,900.47x = 728,990.70 × 148,990.76
  4. Step 4: Simplify right side
    485,900.47x = 108,612,874,036.03
  5. Step 5: Solve for x
    x = 108,612,874,036.03/485,900.47
  6. Step 6: Final answer
    x = 223,529.06

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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.