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Finding the Fourth Proportional to 191,908.90, 287,390.28 and 120,654.76

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Solution

The fourth proportional to 191,908.90, 287,390.28 and 120,654.76 is: 180,684.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,908.90 : 287,390.28 = 120,654.76 : x
  2. Step 2: Convert to fraction form
    191,908.90/287,390.28 = 120,654.76/x
  3. Step 3: Cross multiply
    191,908.90x = 287,390.28 × 120,654.76
  4. Step 4: Simplify right side
    191,908.90x = 34,675,005,259.73
  5. Step 5: Solve for x
    x = 34,675,005,259.73/191,908.90
  6. Step 6: Final answer
    x = 180,684.72

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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.