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Finding the Fourth Proportional to 712.85, 1,068.69 and 317.24

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Solution

The fourth proportional to 712.85, 1,068.69 and 317.24 is: 475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.85 : 1,068.69 = 317.24 : x
  2. Step 2: Convert to fraction form
    712.85/1,068.69 = 317.24/x
  3. Step 3: Cross multiply
    712.85x = 1,068.69 × 317.24
  4. Step 4: Simplify right side
    712.85x = 339,024.29
  5. Step 5: Solve for x
    x = 339,024.29/712.85
  6. Step 6: Final answer
    x = 475.59

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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.