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Finding the Fourth Proportional to 864.79, 1,297.43 and 426.17

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Solution

The fourth proportional to 864.79, 1,297.43 and 426.17 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.79 : 1,297.43 = 426.17 : x
  2. Step 2: Convert to fraction form
    864.79/1,297.43 = 426.17/x
  3. Step 3: Cross multiply
    864.79x = 1,297.43 × 426.17
  4. Step 4: Simplify right side
    864.79x = 552,924.67
  5. Step 5: Solve for x
    x = 552,924.67/864.79
  6. Step 6: Final answer
    x = 639.38

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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.