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Finding the Fourth Proportional to 1,284.70, 1,772.88 and 725.11

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Solution

The fourth proportional to 1,284.70, 1,772.88 and 725.11 is: 1,000.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.70 : 1,772.88 = 725.11 : x
  2. Step 2: Convert to fraction form
    1,284.70/1,772.88 = 725.11/x
  3. Step 3: Cross multiply
    1,284.70x = 1,772.88 × 725.11
  4. Step 4: Simplify right side
    1,284.70x = 1,285,533.02
  5. Step 5: Solve for x
    x = 1,285,533.02/1,284.70
  6. Step 6: Final answer
    x = 1,000.65

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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.