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Finding the Fourth Proportional to 621.40, 937.18 and 556.60

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Solution

The fourth proportional to 621.40, 937.18 and 556.60 is: 839.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.40 : 937.18 = 556.60 : x
  2. Step 2: Convert to fraction form
    621.40/937.18 = 556.60/x
  3. Step 3: Cross multiply
    621.40x = 937.18 × 556.60
  4. Step 4: Simplify right side
    621.40x = 521,634.39
  5. Step 5: Solve for x
    x = 521,634.39/621.40
  6. Step 6: Final answer
    x = 839.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.