Home / 1,438.35-2,155.71-615.66

Finding the Fourth Proportional to 1,438.35, 2,155.71 and 615.66

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Solution

The fourth proportional to 1,438.35, 2,155.71 and 615.66 is: 922.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.35 : 2,155.71 = 615.66 : x
  2. Step 2: Convert to fraction form
    1,438.35/2,155.71 = 615.66/x
  3. Step 3: Cross multiply
    1,438.35x = 2,155.71 × 615.66
  4. Step 4: Simplify right side
    1,438.35x = 1,327,173.64
  5. Step 5: Solve for x
    x = 1,327,173.64/1,438.35
  6. Step 6: Final answer
    x = 922.71

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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.