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Finding the Fourth Proportional to 568.20, 784.32 and 393.72

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Solution

The fourth proportional to 568.20, 784.32 and 393.72 is: 543.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.20 : 784.32 = 393.72 : x
  2. Step 2: Convert to fraction form
    568.20/784.32 = 393.72/x
  3. Step 3: Cross multiply
    568.20x = 784.32 × 393.72
  4. Step 4: Simplify right side
    568.20x = 308,802.47
  5. Step 5: Solve for x
    x = 308,802.47/568.20
  6. Step 6: Final answer
    x = 543.47

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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.