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Finding the Fourth Proportional to 485,875.70, 728,813.55 and 420,921.80

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Solution

The fourth proportional to 485,875.70, 728,813.55 and 420,921.80 is: 631,382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,875.70 : 728,813.55 = 420,921.80 : x
  2. Step 2: Convert to fraction form
    485,875.70/728,813.55 = 420,921.80/x
  3. Step 3: Cross multiply
    485,875.70x = 728,813.55 × 420,921.80
  4. Step 4: Simplify right side
    485,875.70x = 306,773,511,330.39
  5. Step 5: Solve for x
    x = 306,773,511,330.39/485,875.70
  6. Step 6: Final answer
    x = 631,382.70

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1.5x scale

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.