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Finding the Fourth Proportional to 660.79, 985.60 and 622.72

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Solution

The fourth proportional to 660.79, 985.60 and 622.72 is: 928.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.79 : 985.60 = 622.72 : x
  2. Step 2: Convert to fraction form
    660.79/985.60 = 622.72/x
  3. Step 3: Cross multiply
    660.79x = 985.60 × 622.72
  4. Step 4: Simplify right side
    660.79x = 613,752.83
  5. Step 5: Solve for x
    x = 613,752.83/660.79
  6. Step 6: Final answer
    x = 928.82

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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.