Home / 687,617.80-1,031,426.70-628,520.20

Finding the Fourth Proportional to 687,617.80, 1,031,426.70 and 628,520.20

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Solution

The fourth proportional to 687,617.80, 1,031,426.70 and 628,520.20 is: 942,780.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,617.80 : 1,031,426.70 = 628,520.20 : x
  2. Step 2: Convert to fraction form
    687,617.80/1,031,426.70 = 628,520.20/x
  3. Step 3: Cross multiply
    687,617.80x = 1,031,426.70 × 628,520.20
  4. Step 4: Simplify right side
    687,617.80x = 648,272,515,769.34
  5. Step 5: Solve for x
    x = 648,272,515,769.34/687,617.80
  6. Step 6: Final answer
    x = 942,780.30

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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.