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Finding the Fourth Proportional to 458,640.90, 687,378.15 and 221,472.90

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Solution

The fourth proportional to 458,640.90, 687,378.15 and 221,472.90 is: 331,927.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,640.90 : 687,378.15 = 221,472.90 : x
  2. Step 2: Convert to fraction form
    458,640.90/687,378.15 = 221,472.90/x
  3. Step 3: Cross multiply
    458,640.90x = 687,378.15 × 221,472.90
  4. Step 4: Simplify right side
    458,640.90x = 152,235,632,277.14
  5. Step 5: Solve for x
    x = 152,235,632,277.14/458,640.90
  6. Step 6: Final answer
    x = 331,927.73

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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.