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Finding the Fourth Proportional to 218,125.40, 326,928.90 and 91,765.40

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Solution

The fourth proportional to 218,125.40, 326,928.90 and 91,765.40 is: 137,539.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,125.40 : 326,928.90 = 91,765.40 : x
  2. Step 2: Convert to fraction form
    218,125.40/326,928.90 = 91,765.40/x
  3. Step 3: Cross multiply
    218,125.40x = 326,928.90 × 91,765.40
  4. Step 4: Simplify right side
    218,125.40x = 30,000,761,280.06
  5. Step 5: Solve for x
    x = 30,000,761,280.06/218,125.40
  6. Step 6: Final answer
    x = 137,539.05

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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.