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Finding the Fourth Proportional to 128,245.32, 176,979.06 and 74,561.76

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Solution

The fourth proportional to 128,245.32, 176,979.06 and 74,561.76 is: 102,895.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,245.32 : 176,979.06 = 74,561.76 : x
  2. Step 2: Convert to fraction form
    128,245.32/176,979.06 = 74,561.76/x
  3. Step 3: Cross multiply
    128,245.32x = 176,979.06 × 74,561.76
  4. Step 4: Simplify right side
    128,245.32x = 13,195,870,196.75
  5. Step 5: Solve for x
    x = 13,195,870,196.75/128,245.32
  6. Step 6: Final answer
    x = 102,895.53

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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.