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Finding the Fourth Proportional to 138,411.95, 190,953.80 and 87,405.63

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Solution

The fourth proportional to 138,411.95, 190,953.80 and 87,405.63 is: 120,585.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,411.95 : 190,953.80 = 87,405.63 : x
  2. Step 2: Convert to fraction form
    138,411.95/190,953.80 = 87,405.63/x
  3. Step 3: Cross multiply
    138,411.95x = 190,953.80 × 87,405.63
  4. Step 4: Simplify right side
    138,411.95x = 16,690,436,752.87
  5. Step 5: Solve for x
    x = 16,690,436,752.87/138,411.95
  6. Step 6: Final answer
    x = 120,585.23

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1.5x scale

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.