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Finding the Fourth Proportional to 260,761.60, 391,142.40 and 221,492.80

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Solution

The fourth proportional to 260,761.60, 391,142.40 and 221,492.80 is: 332,239.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,761.60 : 391,142.40 = 221,492.80 : x
  2. Step 2: Convert to fraction form
    260,761.60/391,142.40 = 221,492.80/x
  3. Step 3: Cross multiply
    260,761.60x = 391,142.40 × 221,492.80
  4. Step 4: Simplify right side
    260,761.60x = 86,635,225,374.72
  5. Step 5: Solve for x
    x = 86,635,225,374.72/260,761.60
  6. Step 6: Final answer
    x = 332,239.20

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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.