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Finding the Fourth Proportional to 1,115.73, 1,673.08 and 653.62

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Solution

The fourth proportional to 1,115.73, 1,673.08 and 653.62 is: 980.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.73 : 1,673.08 = 653.62 : x
  2. Step 2: Convert to fraction form
    1,115.73/1,673.08 = 653.62/x
  3. Step 3: Cross multiply
    1,115.73x = 1,673.08 × 653.62
  4. Step 4: Simplify right side
    1,115.73x = 1,093,555.28
  5. Step 5: Solve for x
    x = 1,093,555.28/1,115.73
  6. Step 6: Final answer
    x = 980.13

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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.