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Finding the Fourth Proportional to 774.08, 1,068.22 and 419.99

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Solution

The fourth proportional to 774.08, 1,068.22 and 419.99 is: 579.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.08 : 1,068.22 = 419.99 : x
  2. Step 2: Convert to fraction form
    774.08/1,068.22 = 419.99/x
  3. Step 3: Cross multiply
    774.08x = 1,068.22 × 419.99
  4. Step 4: Simplify right side
    774.08x = 448,642.97
  5. Step 5: Solve for x
    x = 448,642.97/774.08
  6. Step 6: Final answer
    x = 579.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.