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Finding the Fourth Proportional to 640.32, 882.72 and 551.42

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Solution

The fourth proportional to 640.32, 882.72 and 551.42 is: 760.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.32 : 882.72 = 551.42 : x
  2. Step 2: Convert to fraction form
    640.32/882.72 = 551.42/x
  3. Step 3: Cross multiply
    640.32x = 882.72 × 551.42
  4. Step 4: Simplify right side
    640.32x = 486,747.66
  5. Step 5: Solve for x
    x = 486,747.66/640.32
  6. Step 6: Final answer
    x = 760.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.