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Finding the Fourth Proportional to 458,028.80, 687,187.20 and 221,379.20

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Solution

The fourth proportional to 458,028.80, 687,187.20 and 221,379.20 is: 332,138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,028.80 : 687,187.20 = 221,379.20 : x
  2. Step 2: Convert to fraction form
    458,028.80/687,187.20 = 221,379.20/x
  3. Step 3: Cross multiply
    458,028.80x = 687,187.20 × 221,379.20
  4. Step 4: Simplify right side
    458,028.80x = 152,128,952,586.24
  5. Step 5: Solve for x
    x = 152,128,952,586.24/458,028.80
  6. Step 6: Final answer
    x = 332,138.40

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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.