Home / 1,431.45-2,147.15-457.55

Finding the Fourth Proportional to 1,431.45, 2,147.15 and 457.55

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Solution

The fourth proportional to 1,431.45, 2,147.15 and 457.55 is: 686.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.45 : 2,147.15 = 457.55 : x
  2. Step 2: Convert to fraction form
    1,431.45/2,147.15 = 457.55/x
  3. Step 3: Cross multiply
    1,431.45x = 2,147.15 × 457.55
  4. Step 4: Simplify right side
    1,431.45x = 982,415.46
  5. Step 5: Solve for x
    x = 982,415.46/1,431.45
  6. Step 6: Final answer
    x = 686.31

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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.