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Finding the Fourth Proportional to 1,808.50, 2,712.78 and 782.50

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Solution

The fourth proportional to 1,808.50, 2,712.78 and 782.50 is: 1,173.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.50 : 2,712.78 = 782.50 : x
  2. Step 2: Convert to fraction form
    1,808.50/2,712.78 = 782.50/x
  3. Step 3: Cross multiply
    1,808.50x = 2,712.78 × 782.50
  4. Step 4: Simplify right side
    1,808.50x = 2,122,750.35
  5. Step 5: Solve for x
    x = 2,122,750.35/1,808.50
  6. Step 6: Final answer
    x = 1,173.76

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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.