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Finding the Fourth Proportional to 1,103.72, 1,521 and 753.80

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Solution

The fourth proportional to 1,103.72, 1,521 and 753.80 is: 1,038.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.72 : 1,521 = 753.80 : x
  2. Step 2: Convert to fraction form
    1,103.72/1,521 = 753.80/x
  3. Step 3: Cross multiply
    1,103.72x = 1,521 × 753.80
  4. Step 4: Simplify right side
    1,103.72x = 1,146,529.80
  5. Step 5: Solve for x
    x = 1,146,529.80/1,103.72
  6. Step 6: Final answer
    x = 1,038.79

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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.