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Finding the Fourth Proportional to 1,109.30, 1,663.07 and 553.72

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Solution

The fourth proportional to 1,109.30, 1,663.07 and 553.72 is: 830.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.30 : 1,663.07 = 553.72 : x
  2. Step 2: Convert to fraction form
    1,109.30/1,663.07 = 553.72/x
  3. Step 3: Cross multiply
    1,109.30x = 1,663.07 × 553.72
  4. Step 4: Simplify right side
    1,109.30x = 920,872.87
  5. Step 5: Solve for x
    x = 920,872.87/1,109.30
  6. Step 6: Final answer
    x = 830.14

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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.