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Finding the Fourth Proportional to 639.34, 957.93 and 615.34

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Solution

The fourth proportional to 639.34, 957.93 and 615.34 is: 921.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.34 : 957.93 = 615.34 : x
  2. Step 2: Convert to fraction form
    639.34/957.93 = 615.34/x
  3. Step 3: Cross multiply
    639.34x = 957.93 × 615.34
  4. Step 4: Simplify right side
    639.34x = 589,452.65
  5. Step 5: Solve for x
    x = 589,452.65/639.34
  6. Step 6: Final answer
    x = 921.97

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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.