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Finding the Fourth Proportional to 1,230.72, 1,845.20 and 866.24

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Solution

The fourth proportional to 1,230.72, 1,845.20 and 866.24 is: 1,298.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.72 : 1,845.20 = 866.24 : x
  2. Step 2: Convert to fraction form
    1,230.72/1,845.20 = 866.24/x
  3. Step 3: Cross multiply
    1,230.72x = 1,845.20 × 866.24
  4. Step 4: Simplify right side
    1,230.72x = 1,598,386.05
  5. Step 5: Solve for x
    x = 1,598,386.05/1,230.72
  6. Step 6: Final answer
    x = 1,298.74

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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.