Home / 679,280.80-1,018,921.20-442,890.40

Finding the Fourth Proportional to 679,280.80, 1,018,921.20 and 442,890.40

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Solution

The fourth proportional to 679,280.80, 1,018,921.20 and 442,890.40 is: 664,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,280.80 : 1,018,921.20 = 442,890.40 : x
  2. Step 2: Convert to fraction form
    679,280.80/1,018,921.20 = 442,890.40/x
  3. Step 3: Cross multiply
    679,280.80x = 1,018,921.20 × 442,890.40
  4. Step 4: Simplify right side
    679,280.80x = 451,270,417,836.48
  5. Step 5: Solve for x
    x = 451,270,417,836.48/679,280.80
  6. Step 6: Final answer
    x = 664,335.60

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Double scale
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Similar ratio
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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.