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Finding the Fourth Proportional to 218,689.64, 328,062.24 and 85,552.82

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Solution

The fourth proportional to 218,689.64, 328,062.24 and 85,552.82 is: 128,340.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,689.64 : 328,062.24 = 85,552.82 : x
  2. Step 2: Convert to fraction form
    218,689.64/328,062.24 = 85,552.82/x
  3. Step 3: Cross multiply
    218,689.64x = 328,062.24 × 85,552.82
  4. Step 4: Simplify right side
    218,689.64x = 28,066,648,127.21
  5. Step 5: Solve for x
    x = 28,066,648,127.21/218,689.64
  6. Step 6: Final answer
    x = 128,340.09

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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.