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Finding the Fourth Proportional to 2,655.65, 3,984.48 and 990.79

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Solution

The fourth proportional to 2,655.65, 3,984.48 and 990.79 is: 1,486.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,655.65 : 3,984.48 = 990.79 : x
  2. Step 2: Convert to fraction form
    2,655.65/3,984.48 = 990.79/x
  3. Step 3: Cross multiply
    2,655.65x = 3,984.48 × 990.79
  4. Step 4: Simplify right side
    2,655.65x = 3,947,772.98
  5. Step 5: Solve for x
    x = 3,947,772.98/2,655.65
  6. Step 6: Final answer
    x = 1,486.55

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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.