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Finding the Fourth Proportional to 1,581, 2,181.70 and 917.74

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Solution

The fourth proportional to 1,581, 2,181.70 and 917.74 is: 1,266.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581 : 2,181.70 = 917.74 : x
  2. Step 2: Convert to fraction form
    1,581/2,181.70 = 917.74/x
  3. Step 3: Cross multiply
    1,581x = 2,181.70 × 917.74
  4. Step 4: Simplify right side
    1,581x = 2,002,233.36
  5. Step 5: Solve for x
    x = 2,002,233.36/1,581
  6. Step 6: Final answer
    x = 1,266.43

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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.