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Finding the Fourth Proportional to 1,113.73, 1,670.57 and 645.90

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Solution

The fourth proportional to 1,113.73, 1,670.57 and 645.90 is: 968.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.73 : 1,670.57 = 645.90 : x
  2. Step 2: Convert to fraction form
    1,113.73/1,670.57 = 645.90/x
  3. Step 3: Cross multiply
    1,113.73x = 1,670.57 × 645.90
  4. Step 4: Simplify right side
    1,113.73x = 1,079,023.49
  5. Step 5: Solve for x
    x = 1,079,023.49/1,113.73
  6. Step 6: Final answer
    x = 968.83

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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.