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Finding the Fourth Proportional to 1,118.24, 1,542.72 and 704

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Solution

The fourth proportional to 1,118.24, 1,542.72 and 704 is: 971.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.24 : 1,542.72 = 704 : x
  2. Step 2: Convert to fraction form
    1,118.24/1,542.72 = 704/x
  3. Step 3: Cross multiply
    1,118.24x = 1,542.72 × 704
  4. Step 4: Simplify right side
    1,118.24x = 1,086,074.88
  5. Step 5: Solve for x
    x = 1,086,074.88/1,118.24
  6. Step 6: Final answer
    x = 971.24

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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.