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Finding the Fourth Proportional to 218,718.80, 328,094.36 and 78,478.64

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Solution

The fourth proportional to 218,718.80, 328,094.36 and 78,478.64 is: 117,723.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,718.80 : 328,094.36 = 78,478.64 : x
  2. Step 2: Convert to fraction form
    218,718.80/328,094.36 = 78,478.64/x
  3. Step 3: Cross multiply
    218,718.80x = 328,094.36 × 78,478.64
  4. Step 4: Simplify right side
    218,718.80x = 25,748,399,164.47
  5. Step 5: Solve for x
    x = 25,748,399,164.47/218,718.80
  6. Step 6: Final answer
    x = 117,723.76

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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.