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Finding the Fourth Proportional to 1,580.90, 2,181.47 and 908.67

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Solution

The fourth proportional to 1,580.90, 2,181.47 and 908.67 is: 1,253.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.90 : 2,181.47 = 908.67 : x
  2. Step 2: Convert to fraction form
    1,580.90/2,181.47 = 908.67/x
  3. Step 3: Cross multiply
    1,580.90x = 2,181.47 × 908.67
  4. Step 4: Simplify right side
    1,580.90x = 1,982,231.80
  5. Step 5: Solve for x
    x = 1,982,231.80/1,580.90
  6. Step 6: Final answer
    x = 1,253.86

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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.