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Finding the Fourth Proportional to 1,590.25, 2,194.64 and 891.67

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Solution

The fourth proportional to 1,590.25, 2,194.64 and 891.67 is: 1,230.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.25 : 2,194.64 = 891.67 : x
  2. Step 2: Convert to fraction form
    1,590.25/2,194.64 = 891.67/x
  3. Step 3: Cross multiply
    1,590.25x = 2,194.64 × 891.67
  4. Step 4: Simplify right side
    1,590.25x = 1,956,894.65
  5. Step 5: Solve for x
    x = 1,956,894.65/1,590.25
  6. Step 6: Final answer
    x = 1,230.56

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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.