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Finding the Fourth Proportional to 128,115.36, 176,785.76 and 74,389.88

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Solution

The fourth proportional to 128,115.36, 176,785.76 and 74,389.88 is: 102,650.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,115.36 : 176,785.76 = 74,389.88 : x
  2. Step 2: Convert to fraction form
    128,115.36/176,785.76 = 74,389.88/x
  3. Step 3: Cross multiply
    128,115.36x = 176,785.76 × 74,389.88
  4. Step 4: Simplify right side
    128,115.36x = 13,151,071,472.11
  5. Step 5: Solve for x
    x = 13,151,071,472.11/128,115.36
  6. Step 6: Final answer
    x = 102,650.23

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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.