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Finding the Fourth Proportional to 229,555, 316,785.90 and 128,953

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Solution

The fourth proportional to 229,555, 316,785.90 and 128,953 is: 177,955.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    229,555 : 316,785.90 = 128,953 : x
  2. Step 2: Convert to fraction form
    229,555/316,785.90 = 128,953/x
  3. Step 3: Cross multiply
    229,555x = 316,785.90 × 128,953
  4. Step 4: Simplify right side
    229,555x = 40,850,492,162.70
  5. Step 5: Solve for x
    x = 40,850,492,162.70/229,555
  6. Step 6: Final answer
    x = 177,955.14

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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.