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Finding the Fourth Proportional to 864.59, 1,296.99 and 279.64

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Solution

The fourth proportional to 864.59, 1,296.99 and 279.64 is: 419.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.59 : 1,296.99 = 279.64 : x
  2. Step 2: Convert to fraction form
    864.59/1,296.99 = 279.64/x
  3. Step 3: Cross multiply
    864.59x = 1,296.99 × 279.64
  4. Step 4: Simplify right side
    864.59x = 362,687.04
  5. Step 5: Solve for x
    x = 362,687.04/864.59
  6. Step 6: Final answer
    x = 419.49

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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.