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Finding the Fourth Proportional to 181,920.80, 272,881.20 and 128,776.70

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Solution

The fourth proportional to 181,920.80, 272,881.20 and 128,776.70 is: 193,165.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    181,920.80 : 272,881.20 = 128,776.70 : x
  2. Step 2: Convert to fraction form
    181,920.80/272,881.20 = 128,776.70/x
  3. Step 3: Cross multiply
    181,920.80x = 272,881.20 × 128,776.70
  4. Step 4: Simplify right side
    181,920.80x = 35,140,740,428.04
  5. Step 5: Solve for x
    x = 35,140,740,428.04/181,920.80
  6. Step 6: Final answer
    x = 193,165.05

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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.