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Finding the Fourth Proportional to 1,128.88, 1,693.65 and 398.65

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Solution

The fourth proportional to 1,128.88, 1,693.65 and 398.65 is: 598.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.88 : 1,693.65 = 398.65 : x
  2. Step 2: Convert to fraction form
    1,128.88/1,693.65 = 398.65/x
  3. Step 3: Cross multiply
    1,128.88x = 1,693.65 × 398.65
  4. Step 4: Simplify right side
    1,128.88x = 675,173.57
  5. Step 5: Solve for x
    x = 675,173.57/1,128.88
  6. Step 6: Final answer
    x = 598.09

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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.