Home / 1,515.60-2,090.88-990.96

Finding the Fourth Proportional to 1,515.60, 2,090.88 and 990.96

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Solution

The fourth proportional to 1,515.60, 2,090.88 and 990.96 is: 1,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.60 : 2,090.88 = 990.96 : x
  2. Step 2: Convert to fraction form
    1,515.60/2,090.88 = 990.96/x
  3. Step 3: Cross multiply
    1,515.60x = 2,090.88 × 990.96
  4. Step 4: Simplify right side
    1,515.60x = 2,071,978.44
  5. Step 5: Solve for x
    x = 2,071,978.44/1,515.60
  6. Step 6: Final answer
    x = 1,367.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.