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Finding the Fourth Proportional to 621.66, 926.49 and 616.56

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Solution

The fourth proportional to 621.66, 926.49 and 616.56 is: 918.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.66 : 926.49 = 616.56 : x
  2. Step 2: Convert to fraction form
    621.66/926.49 = 616.56/x
  3. Step 3: Cross multiply
    621.66x = 926.49 × 616.56
  4. Step 4: Simplify right side
    621.66x = 571,236.67
  5. Step 5: Solve for x
    x = 571,236.67/621.66
  6. Step 6: Final answer
    x = 918.89

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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.