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Finding the Fourth Proportional to 659.79, 984.11 and 621.72

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Solution

The fourth proportional to 659.79, 984.11 and 621.72 is: 927.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.79 : 984.11 = 621.72 : x
  2. Step 2: Convert to fraction form
    659.79/984.11 = 621.72/x
  3. Step 3: Cross multiply
    659.79x = 984.11 × 621.72
  4. Step 4: Simplify right side
    659.79x = 611,837.76
  5. Step 5: Solve for x
    x = 611,837.76/659.79
  6. Step 6: Final answer
    x = 927.32

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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.