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Finding the Fourth Proportional to 1,109.18, 1,663.78 and 621.16

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Solution

The fourth proportional to 1,109.18, 1,663.78 and 621.16 is: 931.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.18 : 1,663.78 = 621.16 : x
  2. Step 2: Convert to fraction form
    1,109.18/1,663.78 = 621.16/x
  3. Step 3: Cross multiply
    1,109.18x = 1,663.78 × 621.16
  4. Step 4: Simplify right side
    1,109.18x = 1,033,473.58
  5. Step 5: Solve for x
    x = 1,033,473.58/1,109.18
  6. Step 6: Final answer
    x = 931.75

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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.