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Finding the Fourth Proportional to 1,431.68, 2,147.85 and 457.79

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Solution

The fourth proportional to 1,431.68, 2,147.85 and 457.79 is: 686.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.68 : 2,147.85 = 457.79 : x
  2. Step 2: Convert to fraction form
    1,431.68/2,147.85 = 457.79/x
  3. Step 3: Cross multiply
    1,431.68x = 2,147.85 × 457.79
  4. Step 4: Simplify right side
    1,431.68x = 983,253.51
  5. Step 5: Solve for x
    x = 983,253.51/1,431.68
  6. Step 6: Final answer
    x = 686.79

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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.