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Finding the Fourth Proportional to 864.23, 1,296.51 and 279.39

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Solution

The fourth proportional to 864.23, 1,296.51 and 279.39 is: 419.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.23 : 1,296.51 = 279.39 : x
  2. Step 2: Convert to fraction form
    864.23/1,296.51 = 279.39/x
  3. Step 3: Cross multiply
    864.23x = 1,296.51 × 279.39
  4. Step 4: Simplify right side
    864.23x = 362,231.93
  5. Step 5: Solve for x
    x = 362,231.93/864.23
  6. Step 6: Final answer
    x = 419.14

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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.