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Finding the Fourth Proportional to 128,080.72, 176,738.66 and 70,716.32

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Solution

The fourth proportional to 128,080.72, 176,738.66 and 70,716.32 is: 97,581.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,080.72 : 176,738.66 = 70,716.32 : x
  2. Step 2: Convert to fraction form
    128,080.72/176,738.66 = 70,716.32/x
  3. Step 3: Cross multiply
    128,080.72x = 176,738.66 × 70,716.32
  4. Step 4: Simplify right side
    128,080.72x = 12,498,307,636.93
  5. Step 5: Solve for x
    x = 12,498,307,636.93/128,080.72
  6. Step 6: Final answer
    x = 97,581.49

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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.