Home / 1,439.21-2,157.08-615.74

Finding the Fourth Proportional to 1,439.21, 2,157.08 and 615.74

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Solution

The fourth proportional to 1,439.21, 2,157.08 and 615.74 is: 922.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.21 : 2,157.08 = 615.74 : x
  2. Step 2: Convert to fraction form
    1,439.21/2,157.08 = 615.74/x
  3. Step 3: Cross multiply
    1,439.21x = 2,157.08 × 615.74
  4. Step 4: Simplify right side
    1,439.21x = 1,328,200.44
  5. Step 5: Solve for x
    x = 1,328,200.44/1,439.21
  6. Step 6: Final answer
    x = 922.87

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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.