Home / 1,558.86-2,151.18-999.12

Finding the Fourth Proportional to 1,558.86, 2,151.18 and 999.12

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Solution

The fourth proportional to 1,558.86, 2,151.18 and 999.12 is: 1,378.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,558.86 : 2,151.18 = 999.12 : x
  2. Step 2: Convert to fraction form
    1,558.86/2,151.18 = 999.12/x
  3. Step 3: Cross multiply
    1,558.86x = 2,151.18 × 999.12
  4. Step 4: Simplify right side
    1,558.86x = 2,149,286.96
  5. Step 5: Solve for x
    x = 2,149,286.96/1,558.86
  6. Step 6: Final answer
    x = 1,378.76

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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.