Home / 1,579.60-2,181.23-991.15

Finding the Fourth Proportional to 1,579.60, 2,181.23 and 991.15

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Solution

The fourth proportional to 1,579.60, 2,181.23 and 991.15 is: 1,368.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.60 : 2,181.23 = 991.15 : x
  2. Step 2: Convert to fraction form
    1,579.60/2,181.23 = 991.15/x
  3. Step 3: Cross multiply
    1,579.60x = 2,181.23 × 991.15
  4. Step 4: Simplify right side
    1,579.60x = 2,161,926.11
  5. Step 5: Solve for x
    x = 2,161,926.11/1,579.60
  6. Step 6: Final answer
    x = 1,368.65

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1.5x scale

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.