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Finding the Fourth Proportional to 458,211.20, 687,489.60 and 221,763.20

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Solution

The fourth proportional to 458,211.20, 687,489.60 and 221,763.20 is: 332,728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,211.20 : 687,489.60 = 221,763.20 : x
  2. Step 2: Convert to fraction form
    458,211.20/687,489.60 = 221,763.20/x
  3. Step 3: Cross multiply
    458,211.20x = 687,489.60 × 221,763.20
  4. Step 4: Simplify right side
    458,211.20x = 152,459,893,662.72
  5. Step 5: Solve for x
    x = 152,459,893,662.72/458,211.20
  6. Step 6: Final answer
    x = 332,728.43

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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.