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Finding the Fourth Proportional to 192,031.70, 288,047.55 and 121,990.10

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Solution

The fourth proportional to 192,031.70, 288,047.55 and 121,990.10 is: 182,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,031.70 : 288,047.55 = 121,990.10 : x
  2. Step 2: Convert to fraction form
    192,031.70/288,047.55 = 121,990.10/x
  3. Step 3: Cross multiply
    192,031.70x = 288,047.55 × 121,990.10
  4. Step 4: Simplify right side
    192,031.70x = 35,138,949,429.26
  5. Step 5: Solve for x
    x = 35,138,949,429.26/192,031.70
  6. Step 6: Final answer
    x = 182,985.15

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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.