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Finding the Fourth Proportional to 1,398.78, 2,096.63 and 576.61

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Solution

The fourth proportional to 1,398.78, 2,096.63 and 576.61 is: 864.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.78 : 2,096.63 = 576.61 : x
  2. Step 2: Convert to fraction form
    1,398.78/2,096.63 = 576.61/x
  3. Step 3: Cross multiply
    1,398.78x = 2,096.63 × 576.61
  4. Step 4: Simplify right side
    1,398.78x = 1,208,934.02
  5. Step 5: Solve for x
    x = 1,208,934.02/1,398.78
  6. Step 6: Final answer
    x = 864.28

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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.