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Finding the Fourth Proportional to 136,538.40, 188,423.88 and 76,112.88

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Solution

The fourth proportional to 136,538.40, 188,423.88 and 76,112.88 is: 105,036.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,538.40 : 188,423.88 = 76,112.88 : x
  2. Step 2: Convert to fraction form
    136,538.40/188,423.88 = 76,112.88/x
  3. Step 3: Cross multiply
    136,538.40x = 188,423.88 × 76,112.88
  4. Step 4: Simplify right side
    136,538.40x = 14,341,484,167.57
  5. Step 5: Solve for x
    x = 14,341,484,167.57/136,538.40
  6. Step 6: Final answer
    x = 105,036.27

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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.