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Finding the Fourth Proportional to 864.80, 1,297.18 and 402.32

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Solution

The fourth proportional to 864.80, 1,297.18 and 402.32 is: 603.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.80 : 1,297.18 = 402.32 : x
  2. Step 2: Convert to fraction form
    864.80/1,297.18 = 402.32/x
  3. Step 3: Cross multiply
    864.80x = 1,297.18 × 402.32
  4. Step 4: Simplify right side
    864.80x = 521,878.66
  5. Step 5: Solve for x
    x = 521,878.66/864.80
  6. Step 6: Final answer
    x = 603.47

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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.