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Finding the Fourth Proportional to 121,911.20, 182,510.40 and 86,919.20

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Solution

The fourth proportional to 121,911.20, 182,510.40 and 86,919.20 is: 130,124.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,911.20 : 182,510.40 = 86,919.20 : x
  2. Step 2: Convert to fraction form
    121,911.20/182,510.40 = 86,919.20/x
  3. Step 3: Cross multiply
    121,911.20x = 182,510.40 × 86,919.20
  4. Step 4: Simplify right side
    121,911.20x = 15,863,657,959.68
  5. Step 5: Solve for x
    x = 15,863,657,959.68/121,911.20
  6. Step 6: Final answer
    x = 130,124.70

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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.