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Finding the Fourth Proportional to 1,603.12, 2,401.20 and 779.66

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Solution

The fourth proportional to 1,603.12, 2,401.20 and 779.66 is: 1,167.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,603.12 : 2,401.20 = 779.66 : x
  2. Step 2: Convert to fraction form
    1,603.12/2,401.20 = 779.66/x
  3. Step 3: Cross multiply
    1,603.12x = 2,401.20 × 779.66
  4. Step 4: Simplify right side
    1,603.12x = 1,872,119.59
  5. Step 5: Solve for x
    x = 1,872,119.59/1,603.12
  6. Step 6: Final answer
    x = 1,167.80

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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.