Home / 218,979.60-328,555.80-85,837.20

Finding the Fourth Proportional to 218,979.60, 328,555.80 and 85,837.20

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Solution

The fourth proportional to 218,979.60, 328,555.80 and 85,837.20 is: 128,789.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,979.60 : 328,555.80 = 85,837.20 : x
  2. Step 2: Convert to fraction form
    218,979.60/328,555.80 = 85,837.20/x
  3. Step 3: Cross multiply
    218,979.60x = 328,555.80 × 85,837.20
  4. Step 4: Simplify right side
    218,979.60x = 28,202,309,915.76
  5. Step 5: Solve for x
    x = 28,202,309,915.76/218,979.60
  6. Step 6: Final answer
    x = 128,789.67

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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.