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Finding the Fourth Proportional to 864.88, 1,296.90 and 426.16

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Solution

The fourth proportional to 864.88, 1,296.90 and 426.16 is: 639.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.88 : 1,296.90 = 426.16 : x
  2. Step 2: Convert to fraction form
    864.88/1,296.90 = 426.16/x
  3. Step 3: Cross multiply
    864.88x = 1,296.90 × 426.16
  4. Step 4: Simplify right side
    864.88x = 552,686.90
  5. Step 5: Solve for x
    x = 552,686.90/864.88
  6. Step 6: Final answer
    x = 639.03

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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.