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Finding the Fourth Proportional to 1,659.78, 2,290.41 and 1,239.30

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Solution

The fourth proportional to 1,659.78, 2,290.41 and 1,239.30 is: 1,710.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.78 : 2,290.41 = 1,239.30 : x
  2. Step 2: Convert to fraction form
    1,659.78/2,290.41 = 1,239.30/x
  3. Step 3: Cross multiply
    1,659.78x = 2,290.41 × 1,239.30
  4. Step 4: Simplify right side
    1,659.78x = 2,838,505.11
  5. Step 5: Solve for x
    x = 2,838,505.11/1,659.78
  6. Step 6: Final answer
    x = 1,710.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.