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Finding the Fourth Proportional to 864.92, 1,297.12 and 431.96

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Solution

The fourth proportional to 864.92, 1,297.12 and 431.96 is: 647.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.92 : 1,297.12 = 431.96 : x
  2. Step 2: Convert to fraction form
    864.92/1,297.12 = 431.96/x
  3. Step 3: Cross multiply
    864.92x = 1,297.12 × 431.96
  4. Step 4: Simplify right side
    864.92x = 560,303.96
  5. Step 5: Solve for x
    x = 560,303.96/864.92
  6. Step 6: Final answer
    x = 647.81

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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.