Home / 687,521.60-1,031,282.40-640,865.60

Finding the Fourth Proportional to 687,521.60, 1,031,282.40 and 640,865.60

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Solution

The fourth proportional to 687,521.60, 1,031,282.40 and 640,865.60 is: 961,298.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,521.60 : 1,031,282.40 = 640,865.60 : x
  2. Step 2: Convert to fraction form
    687,521.60/1,031,282.40 = 640,865.60/x
  3. Step 3: Cross multiply
    687,521.60x = 1,031,282.40 × 640,865.60
  4. Step 4: Simplify right side
    687,521.60x = 660,913,414,045.44
  5. Step 5: Solve for x
    x = 660,913,414,045.44/687,521.60
  6. Step 6: Final answer
    x = 961,298.40

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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.