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Finding the Fourth Proportional to 458,039.80, 687,203.70 and 221,390.20

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Solution

The fourth proportional to 458,039.80, 687,203.70 and 221,390.20 is: 332,154.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,039.80 : 687,203.70 = 221,390.20 : x
  2. Step 2: Convert to fraction form
    458,039.80/687,203.70 = 221,390.20/x
  3. Step 3: Cross multiply
    458,039.80x = 687,203.70 × 221,390.20
  4. Step 4: Simplify right side
    458,039.80x = 152,140,164,583.74
  5. Step 5: Solve for x
    x = 152,140,164,583.74/458,039.80
  6. Step 6: Final answer
    x = 332,154.90

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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.