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Finding the Fourth Proportional to 129,991.40, 179,384.88 and 72,627.20

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Solution

The fourth proportional to 129,991.40, 179,384.88 and 72,627.20 is: 100,223.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,991.40 : 179,384.88 = 72,627.20 : x
  2. Step 2: Convert to fraction form
    129,991.40/179,384.88 = 72,627.20/x
  3. Step 3: Cross multiply
    129,991.40x = 179,384.88 × 72,627.20
  4. Step 4: Simplify right side
    129,991.40x = 13,028,221,556.74
  5. Step 5: Solve for x
    x = 13,028,221,556.74/129,991.40
  6. Step 6: Final answer
    x = 100,223.72

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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.