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Finding the Fourth Proportional to 864.59, 1,296.89 and 215.33

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Solution

The fourth proportional to 864.59, 1,296.89 and 215.33 is: 323.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.59 : 1,296.89 = 215.33 : x
  2. Step 2: Convert to fraction form
    864.59/1,296.89 = 215.33/x
  3. Step 3: Cross multiply
    864.59x = 1,296.89 × 215.33
  4. Step 4: Simplify right side
    864.59x = 279,259.32
  5. Step 5: Solve for x
    x = 279,259.32/864.59
  6. Step 6: Final answer
    x = 323.00

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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.