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Finding the Fourth Proportional to 1,769.30, 2,652.20 and 782.65

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Solution

The fourth proportional to 1,769.30, 2,652.20 and 782.65 is: 1,173.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,769.30 : 2,652.20 = 782.65 : x
  2. Step 2: Convert to fraction form
    1,769.30/2,652.20 = 782.65/x
  3. Step 3: Cross multiply
    1,769.30x = 2,652.20 × 782.65
  4. Step 4: Simplify right side
    1,769.30x = 2,075,744.33
  5. Step 5: Solve for x
    x = 2,075,744.33/1,769.30
  6. Step 6: Final answer
    x = 1,173.20

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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.