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Finding the Fourth Proportional to 1,590.51, 2,194.92 and 891.90

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Solution

The fourth proportional to 1,590.51, 2,194.92 and 891.90 is: 1,230.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.51 : 2,194.92 = 891.90 : x
  2. Step 2: Convert to fraction form
    1,590.51/2,194.92 = 891.90/x
  3. Step 3: Cross multiply
    1,590.51x = 2,194.92 × 891.90
  4. Step 4: Simplify right side
    1,590.51x = 1,957,649.15
  5. Step 5: Solve for x
    x = 1,957,649.15/1,590.51
  6. Step 6: Final answer
    x = 1,230.83

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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.