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Finding the Fourth Proportional to 1,511.96, 2,266.65 and 689.94

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Solution

The fourth proportional to 1,511.96, 2,266.65 and 689.94 is: 1,034.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.96 : 2,266.65 = 689.94 : x
  2. Step 2: Convert to fraction form
    1,511.96/2,266.65 = 689.94/x
  3. Step 3: Cross multiply
    1,511.96x = 2,266.65 × 689.94
  4. Step 4: Simplify right side
    1,511.96x = 1,563,852.50
  5. Step 5: Solve for x
    x = 1,563,852.50/1,511.96
  6. Step 6: Final answer
    x = 1,034.32

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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.