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Finding the Fourth Proportional to 2,839.80, 4,259.71 and 990.91

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Solution

The fourth proportional to 2,839.80, 4,259.71 and 990.91 is: 1,486.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,839.80 : 4,259.71 = 990.91 : x
  2. Step 2: Convert to fraction form
    2,839.80/4,259.71 = 990.91/x
  3. Step 3: Cross multiply
    2,839.80x = 4,259.71 × 990.91
  4. Step 4: Simplify right side
    2,839.80x = 4,220,970.41
  5. Step 5: Solve for x
    x = 4,220,970.41/2,839.80
  6. Step 6: Final answer
    x = 1,486.36

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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.