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Finding the Fourth Proportional to 1,439.79, 2,157.92 and 616.32

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Solution

The fourth proportional to 1,439.79, 2,157.92 and 616.32 is: 923.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.79 : 2,157.92 = 616.32 : x
  2. Step 2: Convert to fraction form
    1,439.79/2,157.92 = 616.32/x
  3. Step 3: Cross multiply
    1,439.79x = 2,157.92 × 616.32
  4. Step 4: Simplify right side
    1,439.79x = 1,329,969.25
  5. Step 5: Solve for x
    x = 1,329,969.25/1,439.79
  6. Step 6: Final answer
    x = 923.72

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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.