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Finding the Fourth Proportional to 608.47, 839.56 and 387.34

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Solution

The fourth proportional to 608.47, 839.56 and 387.34 is: 534.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.47 : 839.56 = 387.34 : x
  2. Step 2: Convert to fraction form
    608.47/839.56 = 387.34/x
  3. Step 3: Cross multiply
    608.47x = 839.56 × 387.34
  4. Step 4: Simplify right side
    608.47x = 325,195.17
  5. Step 5: Solve for x
    x = 325,195.17/608.47
  6. Step 6: Final answer
    x = 534.45

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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.