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Finding the Fourth Proportional to 1,431.54, 2,146.32 and 457.92

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Solution

The fourth proportional to 1,431.54, 2,146.32 and 457.92 is: 686.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.54 : 2,146.32 = 457.92 : x
  2. Step 2: Convert to fraction form
    1,431.54/2,146.32 = 457.92/x
  3. Step 3: Cross multiply
    1,431.54x = 2,146.32 × 457.92
  4. Step 4: Simplify right side
    1,431.54x = 982,842.85
  5. Step 5: Solve for x
    x = 982,842.85/1,431.54
  6. Step 6: Final answer
    x = 686.56

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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.