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Finding the Fourth Proportional to 1,138.91, 1,708.59 and 359.01

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Solution

The fourth proportional to 1,138.91, 1,708.59 and 359.01 is: 538.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.91 : 1,708.59 = 359.01 : x
  2. Step 2: Convert to fraction form
    1,138.91/1,708.59 = 359.01/x
  3. Step 3: Cross multiply
    1,138.91x = 1,708.59 × 359.01
  4. Step 4: Simplify right side
    1,138.91x = 613,400.90
  5. Step 5: Solve for x
    x = 613,400.90/1,138.91
  6. Step 6: Final answer
    x = 538.59

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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.