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Finding the Fourth Proportional to 458,027.80, 687,185.70 and 221,378.20

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Solution

The fourth proportional to 458,027.80, 687,185.70 and 221,378.20 is: 332,136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,027.80 : 687,185.70 = 221,378.20 : x
  2. Step 2: Convert to fraction form
    458,027.80/687,185.70 = 221,378.20/x
  3. Step 3: Cross multiply
    458,027.80x = 687,185.70 × 221,378.20
  4. Step 4: Simplify right side
    458,027.80x = 152,127,933,331.74
  5. Step 5: Solve for x
    x = 152,127,933,331.74/458,027.80
  6. Step 6: Final answer
    x = 332,136.90

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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.