Home / 128,111.36-176,780.24-74,385.88

Finding the Fourth Proportional to 128,111.36, 176,780.24 and 74,385.88

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Solution

The fourth proportional to 128,111.36, 176,780.24 and 74,385.88 is: 102,644.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,111.36 : 176,780.24 = 74,385.88 : x
  2. Step 2: Convert to fraction form
    128,111.36/176,780.24 = 74,385.88/x
  3. Step 3: Cross multiply
    128,111.36x = 176,780.24 × 74,385.88
  4. Step 4: Simplify right side
    128,111.36x = 13,149,953,719.01
  5. Step 5: Solve for x
    x = 13,149,953,719.01/128,111.36
  6. Step 6: Final answer
    x = 102,644.71

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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.