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Finding the Fourth Proportional to 129,984, 179,405.64 and 89,203.92

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Solution

The fourth proportional to 129,984, 179,405.64 and 89,203.92 is: 123,120.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,984 : 179,405.64 = 89,203.92 : x
  2. Step 2: Convert to fraction form
    129,984/179,405.64 = 89,203.92/x
  3. Step 3: Cross multiply
    129,984x = 179,405.64 × 89,203.92
  4. Step 4: Simplify right side
    129,984x = 16,003,686,358.11
  5. Step 5: Solve for x
    x = 16,003,686,358.11/129,984
  6. Step 6: Final answer
    x = 123,120.43

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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.