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Finding the Fourth Proportional to 155,791.62, 215,078.90 and 102,155.45

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Solution

The fourth proportional to 155,791.62, 215,078.90 and 102,155.45 is: 141,031.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,791.62 : 215,078.90 = 102,155.45 : x
  2. Step 2: Convert to fraction form
    155,791.62/215,078.90 = 102,155.45/x
  3. Step 3: Cross multiply
    155,791.62x = 215,078.90 × 102,155.45
  4. Step 4: Simplify right side
    155,791.62x = 21,971,480,228.83
  5. Step 5: Solve for x
    x = 21,971,480,228.83/155,791.62
  6. Step 6: Final answer
    x = 141,031.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.