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Finding the Fourth Proportional to 1,559.66, 2,151.60 and 999.86

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Solution

The fourth proportional to 1,559.66, 2,151.60 and 999.86 is: 1,379.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,559.66 : 2,151.60 = 999.86 : x
  2. Step 2: Convert to fraction form
    1,559.66/2,151.60 = 999.86/x
  3. Step 3: Cross multiply
    1,559.66x = 2,151.60 × 999.86
  4. Step 4: Simplify right side
    1,559.66x = 2,151,288.02
  5. Step 5: Solve for x
    x = 2,151,288.02/1,559.66
  6. Step 6: Final answer
    x = 1,379.34

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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.