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Finding the Fourth Proportional to 458,318.20, 687,650.10 and 221,870.20

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Solution

The fourth proportional to 458,318.20, 687,650.10 and 221,870.20 is: 332,888.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,318.20 : 687,650.10 = 221,870.20 : x
  2. Step 2: Convert to fraction form
    458,318.20/687,650.10 = 221,870.20/x
  3. Step 3: Cross multiply
    458,318.20x = 687,650.10 × 221,870.20
  4. Step 4: Simplify right side
    458,318.20x = 152,569,065,217.02
  5. Step 5: Solve for x
    x = 152,569,065,217.02/458,318.20
  6. Step 6: Final answer
    x = 332,888.95

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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.