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Finding the Fourth Proportional to 260,515.20, 390,902.40 and 102,748.80

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Solution

The fourth proportional to 260,515.20, 390,902.40 and 102,748.80 is: 154,174.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,515.20 : 390,902.40 = 102,748.80 : x
  2. Step 2: Convert to fraction form
    260,515.20/390,902.40 = 102,748.80/x
  3. Step 3: Cross multiply
    260,515.20x = 390,902.40 × 102,748.80
  4. Step 4: Simplify right side
    260,515.20x = 40,164,752,517.12
  5. Step 5: Solve for x
    x = 40,164,752,517.12/260,515.20
  6. Step 6: Final answer
    x = 154,174.32

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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.