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Finding the Fourth Proportional to 1,128.58, 1,691.43 and 608.79

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Solution

The fourth proportional to 1,128.58, 1,691.43 and 608.79 is: 912.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.58 : 1,691.43 = 608.79 : x
  2. Step 2: Convert to fraction form
    1,128.58/1,691.43 = 608.79/x
  3. Step 3: Cross multiply
    1,128.58x = 1,691.43 × 608.79
  4. Step 4: Simplify right side
    1,128.58x = 1,029,725.67
  5. Step 5: Solve for x
    x = 1,029,725.67/1,128.58
  6. Step 6: Final answer
    x = 912.41

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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.