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Finding the Fourth Proportional to 121,257.70, 181,886.55 and 91,733.20

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Solution

The fourth proportional to 121,257.70, 181,886.55 and 91,733.20 is: 137,599.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,257.70 : 181,886.55 = 91,733.20 : x
  2. Step 2: Convert to fraction form
    121,257.70/181,886.55 = 91,733.20/x
  3. Step 3: Cross multiply
    121,257.70x = 181,886.55 × 91,733.20
  4. Step 4: Simplify right side
    121,257.70x = 16,685,035,268.46
  5. Step 5: Solve for x
    x = 16,685,035,268.46/121,257.70
  6. Step 6: Final answer
    x = 137,599.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.