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Finding the Fourth Proportional to 1,765.29, 2,646.20 and 778.65

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Solution

The fourth proportional to 1,765.29, 2,646.20 and 778.65 is: 1,167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.29 : 2,646.20 = 778.65 : x
  2. Step 2: Convert to fraction form
    1,765.29/2,646.20 = 778.65/x
  3. Step 3: Cross multiply
    1,765.29x = 2,646.20 × 778.65
  4. Step 4: Simplify right side
    1,765.29x = 2,060,455.65
  5. Step 5: Solve for x
    x = 2,060,455.65/1,765.29
  6. Step 6: Final answer
    x = 1,167.20

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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.