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Finding the Fourth Proportional to 128,899.50, 193,341.48 and 76,641.54

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Solution

The fourth proportional to 128,899.50, 193,341.48 and 76,641.54 is: 114,957.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,899.50 : 193,341.48 = 76,641.54 : x
  2. Step 2: Convert to fraction form
    128,899.50/193,341.48 = 76,641.54/x
  3. Step 3: Cross multiply
    128,899.50x = 193,341.48 × 76,641.54
  4. Step 4: Simplify right side
    128,899.50x = 14,817,988,773.08
  5. Step 5: Solve for x
    x = 14,817,988,773.08/128,899.50
  6. Step 6: Final answer
    x = 114,957.69

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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.