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Finding the Fourth Proportional to 155,041.62, 213,960.06 and 86,129.28

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Solution

The fourth proportional to 155,041.62, 213,960.06 and 86,129.28 is: 118,859.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,041.62 : 213,960.06 = 86,129.28 : x
  2. Step 2: Convert to fraction form
    155,041.62/213,960.06 = 86,129.28/x
  3. Step 3: Cross multiply
    155,041.62x = 213,960.06 × 86,129.28
  4. Step 4: Simplify right side
    155,041.62x = 18,428,225,916.56
  5. Step 5: Solve for x
    x = 18,428,225,916.56/155,041.62
  6. Step 6: Final answer
    x = 118,859.86

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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.