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Finding the Fourth Proportional to 871.72, 1,306.74 and 294.28

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Solution

The fourth proportional to 871.72, 1,306.74 and 294.28 is: 441.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.72 : 1,306.74 = 294.28 : x
  2. Step 2: Convert to fraction form
    871.72/1,306.74 = 294.28/x
  3. Step 3: Cross multiply
    871.72x = 1,306.74 × 294.28
  4. Step 4: Simplify right side
    871.72x = 384,547.45
  5. Step 5: Solve for x
    x = 384,547.45/871.72
  6. Step 6: Final answer
    x = 441.14

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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.