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Finding the Fourth Proportional to 872.30, 1,307.48 and 316.78

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Solution

The fourth proportional to 872.30, 1,307.48 and 316.78 is: 474.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.30 : 1,307.48 = 316.78 : x
  2. Step 2: Convert to fraction form
    872.30/1,307.48 = 316.78/x
  3. Step 3: Cross multiply
    872.30x = 1,307.48 × 316.78
  4. Step 4: Simplify right side
    872.30x = 414,178.66
  5. Step 5: Solve for x
    x = 414,178.66/872.30
  6. Step 6: Final answer
    x = 474.81

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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.