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Finding the Fourth Proportional to 1,660.75, 2,490.93 and 620.79

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Solution

The fourth proportional to 1,660.75, 2,490.93 and 620.79 is: 931.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.75 : 2,490.93 = 620.79 : x
  2. Step 2: Convert to fraction form
    1,660.75/2,490.93 = 620.79/x
  3. Step 3: Cross multiply
    1,660.75x = 2,490.93 × 620.79
  4. Step 4: Simplify right side
    1,660.75x = 1,546,344.43
  5. Step 5: Solve for x
    x = 1,546,344.43/1,660.75
  6. Step 6: Final answer
    x = 931.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.