Home / 687,586.60-1,031,379.90-640,930.60

Finding the Fourth Proportional to 687,586.60, 1,031,379.90 and 640,930.60

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Solution

The fourth proportional to 687,586.60, 1,031,379.90 and 640,930.60 is: 961,395.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,586.60 : 1,031,379.90 = 640,930.60 : x
  2. Step 2: Convert to fraction form
    687,586.60/1,031,379.90 = 640,930.60/x
  3. Step 3: Cross multiply
    687,586.60x = 1,031,379.90 × 640,930.60
  4. Step 4: Simplify right side
    687,586.60x = 661,042,938,134.94
  5. Step 5: Solve for x
    x = 661,042,938,134.94/687,586.60
  6. Step 6: Final answer
    x = 961,395.90

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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.