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Finding the Fourth Proportional to 1,511.56, 2,085.30 and 881.88

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Solution

The fourth proportional to 1,511.56, 2,085.30 and 881.88 is: 1,216.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.56 : 2,085.30 = 881.88 : x
  2. Step 2: Convert to fraction form
    1,511.56/2,085.30 = 881.88/x
  3. Step 3: Cross multiply
    1,511.56x = 2,085.30 × 881.88
  4. Step 4: Simplify right side
    1,511.56x = 1,838,984.36
  5. Step 5: Solve for x
    x = 1,838,984.36/1,511.56
  6. Step 6: Final answer
    x = 1,216.61

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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.