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Finding the Fourth Proportional to 689.97, 1,034.16 and 393.75

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Solution

The fourth proportional to 689.97, 1,034.16 and 393.75 is: 590.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.97 : 1,034.16 = 393.75 : x
  2. Step 2: Convert to fraction form
    689.97/1,034.16 = 393.75/x
  3. Step 3: Cross multiply
    689.97x = 1,034.16 × 393.75
  4. Step 4: Simplify right side
    689.97x = 407,200.50
  5. Step 5: Solve for x
    x = 407,200.50/689.97
  6. Step 6: Final answer
    x = 590.17

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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.