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Finding the Fourth Proportional to 1,021.32, 1,529.55 and 749.16

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Solution

The fourth proportional to 1,021.32, 1,529.55 and 749.16 is: 1,121.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.32 : 1,529.55 = 749.16 : x
  2. Step 2: Convert to fraction form
    1,021.32/1,529.55 = 749.16/x
  3. Step 3: Cross multiply
    1,021.32x = 1,529.55 × 749.16
  4. Step 4: Simplify right side
    1,021.32x = 1,145,877.68
  5. Step 5: Solve for x
    x = 1,145,877.68/1,021.32
  6. Step 6: Final answer
    x = 1,121.96

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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.