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Finding the Fourth Proportional to 2,218.80, 3,328.96 and 987.06

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Solution

The fourth proportional to 2,218.80, 3,328.96 and 987.06 is: 1,480.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,218.80 : 3,328.96 = 987.06 : x
  2. Step 2: Convert to fraction form
    2,218.80/3,328.96 = 987.06/x
  3. Step 3: Cross multiply
    2,218.80x = 3,328.96 × 987.06
  4. Step 4: Simplify right side
    2,218.80x = 3,285,883.26
  5. Step 5: Solve for x
    x = 3,285,883.26/2,218.80
  6. Step 6: Final answer
    x = 1,480.93

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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.