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Finding the Fourth Proportional to 864.46, 1,297.11 and 431.38

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Solution

The fourth proportional to 864.46, 1,297.11 and 431.38 is: 647.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.46 : 1,297.11 = 431.38 : x
  2. Step 2: Convert to fraction form
    864.46/1,297.11 = 431.38/x
  3. Step 3: Cross multiply
    864.46x = 1,297.11 × 431.38
  4. Step 4: Simplify right side
    864.46x = 559,547.31
  5. Step 5: Solve for x
    x = 559,547.31/864.46
  6. Step 6: Final answer
    x = 647.28

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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.