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Finding the Fourth Proportional to 218,867.51, 328,449 and 85,731.26

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Solution

The fourth proportional to 218,867.51, 328,449 and 85,731.26 is: 128,654.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,867.51 : 328,449 = 85,731.26 : x
  2. Step 2: Convert to fraction form
    218,867.51/328,449 = 85,731.26/x
  3. Step 3: Cross multiply
    218,867.51x = 328,449 × 85,731.26
  4. Step 4: Simplify right side
    218,867.51x = 28,158,346,615.74
  5. Step 5: Solve for x
    x = 28,158,346,615.74/218,867.51
  6. Step 6: Final answer
    x = 128,654.76

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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.