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Finding the Fourth Proportional to 639.26, 957.32 and 528.90

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Solution

The fourth proportional to 639.26, 957.32 and 528.90 is: 792.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.26 : 957.32 = 528.90 : x
  2. Step 2: Convert to fraction form
    639.26/957.32 = 528.90/x
  3. Step 3: Cross multiply
    639.26x = 957.32 × 528.90
  4. Step 4: Simplify right side
    639.26x = 506,326.55
  5. Step 5: Solve for x
    x = 506,326.55/639.26
  6. Step 6: Final answer
    x = 792.05

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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.