Home / 687,772.80-1,031,659.20-407,145.60

Finding the Fourth Proportional to 687,772.80, 1,031,659.20 and 407,145.60

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Solution

The fourth proportional to 687,772.80, 1,031,659.20 and 407,145.60 is: 610,718.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,772.80 : 1,031,659.20 = 407,145.60 : x
  2. Step 2: Convert to fraction form
    687,772.80/1,031,659.20 = 407,145.60/x
  3. Step 3: Cross multiply
    687,772.80x = 1,031,659.20 × 407,145.60
  4. Step 4: Simplify right side
    687,772.80x = 420,035,503,979.52
  5. Step 5: Solve for x
    x = 420,035,503,979.52/687,772.80
  6. Step 6: Final answer
    x = 610,718.40

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Similar ratio
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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.