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Finding the Fourth Proportional to 1,101.72, 1,519.74 and 687

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Solution

The fourth proportional to 1,101.72, 1,519.74 and 687 is: 947.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.72 : 1,519.74 = 687 : x
  2. Step 2: Convert to fraction form
    1,101.72/1,519.74 = 687/x
  3. Step 3: Cross multiply
    1,101.72x = 1,519.74 × 687
  4. Step 4: Simplify right side
    1,101.72x = 1,044,061.38
  5. Step 5: Solve for x
    x = 1,044,061.38/1,101.72
  6. Step 6: Final answer
    x = 947.66

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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.