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Finding the Fourth Proportional to 864.24, 1,296.36 and 287.04

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Solution

The fourth proportional to 864.24, 1,296.36 and 287.04 is: 430.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.24 : 1,296.36 = 287.04 : x
  2. Step 2: Convert to fraction form
    864.24/1,296.36 = 287.04/x
  3. Step 3: Cross multiply
    864.24x = 1,296.36 × 287.04
  4. Step 4: Simplify right side
    864.24x = 372,107.17
  5. Step 5: Solve for x
    x = 372,107.17/864.24
  6. Step 6: Final answer
    x = 430.56

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1.5x scale

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.