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Finding the Fourth Proportional to 1,646.95, 2,469.21 and 780.25

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Solution

The fourth proportional to 1,646.95, 2,469.21 and 780.25 is: 1,169.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,646.95 : 2,469.21 = 780.25 : x
  2. Step 2: Convert to fraction form
    1,646.95/2,469.21 = 780.25/x
  3. Step 3: Cross multiply
    1,646.95x = 2,469.21 × 780.25
  4. Step 4: Simplify right side
    1,646.95x = 1,926,601.10
  5. Step 5: Solve for x
    x = 1,926,601.10/1,646.95
  6. Step 6: Final answer
    x = 1,169.80

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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.