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Finding the Fourth Proportional to 1,113.85, 1,670.46 and 748.81

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Solution

The fourth proportional to 1,113.85, 1,670.46 and 748.81 is: 1,123.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.85 : 1,670.46 = 748.81 : x
  2. Step 2: Convert to fraction form
    1,113.85/1,670.46 = 748.81/x
  3. Step 3: Cross multiply
    1,113.85x = 1,670.46 × 748.81
  4. Step 4: Simplify right side
    1,113.85x = 1,250,857.15
  5. Step 5: Solve for x
    x = 1,250,857.15/1,113.85
  6. Step 6: Final answer
    x = 1,123.00

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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.