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Finding the Fourth Proportional to 260,487.20, 390,074.70 and 207,999.20

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Solution

The fourth proportional to 260,487.20, 390,074.70 and 207,999.20 is: 311,474.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,487.20 : 390,074.70 = 207,999.20 : x
  2. Step 2: Convert to fraction form
    260,487.20/390,074.70 = 207,999.20/x
  3. Step 3: Cross multiply
    260,487.20x = 390,074.70 × 207,999.20
  4. Step 4: Simplify right side
    260,487.20x = 81,135,225,540.24
  5. Step 5: Solve for x
    x = 81,135,225,540.24/260,487.20
  6. Step 6: Final answer
    x = 311,474.90

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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.