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Finding the Fourth Proportional to 864.71, 1,297.20 and 279.52

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Solution

The fourth proportional to 864.71, 1,297.20 and 279.52 is: 419.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.71 : 1,297.20 = 279.52 : x
  2. Step 2: Convert to fraction form
    864.71/1,297.20 = 279.52/x
  3. Step 3: Cross multiply
    864.71x = 1,297.20 × 279.52
  4. Step 4: Simplify right side
    864.71x = 362,585.46
  5. Step 5: Solve for x
    x = 362,585.46/864.71
  6. Step 6: Final answer
    x = 419.31

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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.