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Finding the Fourth Proportional to 485,765.80, 728,648.70 and 148,805.80

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Solution

The fourth proportional to 485,765.80, 728,648.70 and 148,805.80 is: 223,208.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,765.80 : 728,648.70 = 148,805.80 : x
  2. Step 2: Convert to fraction form
    485,765.80/728,648.70 = 148,805.80/x
  3. Step 3: Cross multiply
    485,765.80x = 728,648.70 × 148,805.80
  4. Step 4: Simplify right side
    485,765.80x = 108,427,152,722.46
  5. Step 5: Solve for x
    x = 108,427,152,722.46/485,765.80
  6. Step 6: Final answer
    x = 223,208.70

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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.