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Finding the Fourth Proportional to 1,669.83, 2,506.77 and 781.21

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Solution

The fourth proportional to 1,669.83, 2,506.77 and 781.21 is: 1,172.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,669.83 : 2,506.77 = 781.21 : x
  2. Step 2: Convert to fraction form
    1,669.83/2,506.77 = 781.21/x
  3. Step 3: Cross multiply
    1,669.83x = 2,506.77 × 781.21
  4. Step 4: Simplify right side
    1,669.83x = 1,958,316.93
  5. Step 5: Solve for x
    x = 1,958,316.93/1,669.83
  6. Step 6: Final answer
    x = 1,172.77

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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.