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Finding the Fourth Proportional to 1,129.34, 1,694.28 and 398.99

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Solution

The fourth proportional to 1,129.34, 1,694.28 and 398.99 is: 598.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.34 : 1,694.28 = 398.99 : x
  2. Step 2: Convert to fraction form
    1,129.34/1,694.28 = 398.99/x
  3. Step 3: Cross multiply
    1,129.34x = 1,694.28 × 398.99
  4. Step 4: Simplify right side
    1,129.34x = 676,000.78
  5. Step 5: Solve for x
    x = 676,000.78/1,129.34
  6. Step 6: Final answer
    x = 598.58

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Double scale
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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.