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Finding the Fourth Proportional to 260,142.50, 390,250.95 and 80,243.12

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Solution

The fourth proportional to 260,142.50, 390,250.95 and 80,243.12 is: 120,376.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,142.50 : 390,250.95 = 80,243.12 : x
  2. Step 2: Convert to fraction form
    260,142.50/390,250.95 = 80,243.12/x
  3. Step 3: Cross multiply
    260,142.50x = 390,250.95 × 80,243.12
  4. Step 4: Simplify right side
    260,142.50x = 31,314,954,485.68
  5. Step 5: Solve for x
    x = 31,314,954,485.68/260,142.50
  6. Step 6: Final answer
    x = 120,376.16

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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.