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Finding the Fourth Proportional to 387,388.68, 580,326.32 and 218,397.87

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Solution

The fourth proportional to 387,388.68, 580,326.32 and 218,397.87 is: 327,170.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,388.68 : 580,326.32 = 218,397.87 : x
  2. Step 2: Convert to fraction form
    387,388.68/580,326.32 = 218,397.87/x
  3. Step 3: Cross multiply
    387,388.68x = 580,326.32 × 218,397.87
  4. Step 4: Simplify right side
    387,388.68x = 126,742,032,738.93
  5. Step 5: Solve for x
    x = 126,742,032,738.93/387,388.68
  6. Step 6: Final answer
    x = 327,170.21

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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.