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Finding the Fourth Proportional to 781.15, 1,171.76 and 204.01

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Solution

The fourth proportional to 781.15, 1,171.76 and 204.01 is: 306.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.15 : 1,171.76 = 204.01 : x
  2. Step 2: Convert to fraction form
    781.15/1,171.76 = 204.01/x
  3. Step 3: Cross multiply
    781.15x = 1,171.76 × 204.01
  4. Step 4: Simplify right side
    781.15x = 239,050.76
  5. Step 5: Solve for x
    x = 239,050.76/781.15
  6. Step 6: Final answer
    x = 306.02

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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.