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Finding the Fourth Proportional to 1,511.81, 2,086.31 and 882.78

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Solution

The fourth proportional to 1,511.81, 2,086.31 and 882.78 is: 1,218.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.81 : 2,086.31 = 882.78 : x
  2. Step 2: Convert to fraction form
    1,511.81/2,086.31 = 882.78/x
  3. Step 3: Cross multiply
    1,511.81x = 2,086.31 × 882.78
  4. Step 4: Simplify right side
    1,511.81x = 1,841,752.74
  5. Step 5: Solve for x
    x = 1,841,752.74/1,511.81
  6. Step 6: Final answer
    x = 1,218.24

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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.