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Finding the Fourth Proportional to 640.32, 955.20 and 562.56

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Solution

The fourth proportional to 640.32, 955.20 and 562.56 is: 839.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.32 : 955.20 = 562.56 : x
  2. Step 2: Convert to fraction form
    640.32/955.20 = 562.56/x
  3. Step 3: Cross multiply
    640.32x = 955.20 × 562.56
  4. Step 4: Simplify right side
    640.32x = 537,357.31
  5. Step 5: Solve for x
    x = 537,357.31/640.32
  6. Step 6: Final answer
    x = 839.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.