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Finding the Fourth Proportional to 1,080, 1,490.58 and 817.56

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Solution

The fourth proportional to 1,080, 1,490.58 and 817.56 is: 1,128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080 : 1,490.58 = 817.56 : x
  2. Step 2: Convert to fraction form
    1,080/1,490.58 = 817.56/x
  3. Step 3: Cross multiply
    1,080x = 1,490.58 × 817.56
  4. Step 4: Simplify right side
    1,080x = 1,218,638.58
  5. Step 5: Solve for x
    x = 1,218,638.58/1,080
  6. Step 6: Final answer
    x = 1,128.37

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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.