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Finding the Fourth Proportional to 1,111.46, 1,667.46 and 721.45

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Solution

The fourth proportional to 1,111.46, 1,667.46 and 721.45 is: 1,082.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.46 : 1,667.46 = 721.45 : x
  2. Step 2: Convert to fraction form
    1,111.46/1,667.46 = 721.45/x
  3. Step 3: Cross multiply
    1,111.46x = 1,667.46 × 721.45
  4. Step 4: Simplify right side
    1,111.46x = 1,202,980.68
  5. Step 5: Solve for x
    x = 1,202,980.68/1,111.46
  6. Step 6: Final answer
    x = 1,082.34

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Double scale
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1.5x scale

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.