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Finding the Fourth Proportional to 779.94, 1,169.28 and 409.50

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Solution

The fourth proportional to 779.94, 1,169.28 and 409.50 is: 613.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.94 : 1,169.28 = 409.50 : x
  2. Step 2: Convert to fraction form
    779.94/1,169.28 = 409.50/x
  3. Step 3: Cross multiply
    779.94x = 1,169.28 × 409.50
  4. Step 4: Simplify right side
    779.94x = 478,820.16
  5. Step 5: Solve for x
    x = 478,820.16/779.94
  6. Step 6: Final answer
    x = 613.92

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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.