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Finding the Fourth Proportional to 1,071.99, 1,605.49 and 1,042.43

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Solution

The fourth proportional to 1,071.99, 1,605.49 and 1,042.43 is: 1,561.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.99 : 1,605.49 = 1,042.43 : x
  2. Step 2: Convert to fraction form
    1,071.99/1,605.49 = 1,042.43/x
  3. Step 3: Cross multiply
    1,071.99x = 1,605.49 × 1,042.43
  4. Step 4: Simplify right side
    1,071.99x = 1,673,612.35
  5. Step 5: Solve for x
    x = 1,673,612.35/1,071.99
  6. Step 6: Final answer
    x = 1,561.22

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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.