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Finding the Fourth Proportional to 1,511.40, 2,267.06 and 689.88

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Solution

The fourth proportional to 1,511.40, 2,267.06 and 689.88 is: 1,034.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.40 : 2,267.06 = 689.88 : x
  2. Step 2: Convert to fraction form
    1,511.40/2,267.06 = 689.88/x
  3. Step 3: Cross multiply
    1,511.40x = 2,267.06 × 689.88
  4. Step 4: Simplify right side
    1,511.40x = 1,563,995.90
  5. Step 5: Solve for x
    x = 1,563,995.90/1,511.40
  6. Step 6: Final answer
    x = 1,034.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.