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Finding the Fourth Proportional to 129,065.60, 178,112.77 and 75,352.88

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Solution

The fourth proportional to 129,065.60, 178,112.77 and 75,352.88 is: 103,988.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,065.60 : 178,112.77 = 75,352.88 : x
  2. Step 2: Convert to fraction form
    129,065.60/178,112.77 = 75,352.88/x
  3. Step 3: Cross multiply
    129,065.60x = 178,112.77 × 75,352.88
  4. Step 4: Simplify right side
    129,065.60x = 13,421,310,441.18
  5. Step 5: Solve for x
    x = 13,421,310,441.18/129,065.60
  6. Step 6: Final answer
    x = 103,988.28

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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.