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Finding the Fourth Proportional to 1,431.78, 2,147.65 and 457.86

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Solution

The fourth proportional to 1,431.78, 2,147.65 and 457.86 is: 686.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.78 : 2,147.65 = 457.86 : x
  2. Step 2: Convert to fraction form
    1,431.78/2,147.65 = 457.86/x
  3. Step 3: Cross multiply
    1,431.78x = 2,147.65 × 457.86
  4. Step 4: Simplify right side
    1,431.78x = 983,323.03
  5. Step 5: Solve for x
    x = 983,323.03/1,431.78
  6. Step 6: Final answer
    x = 686.78

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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.