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Finding the Fourth Proportional to 774.38, 1,068.63 and 420.29

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Solution

The fourth proportional to 774.38, 1,068.63 and 420.29 is: 579.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.38 : 1,068.63 = 420.29 : x
  2. Step 2: Convert to fraction form
    774.38/1,068.63 = 420.29/x
  3. Step 3: Cross multiply
    774.38x = 1,068.63 × 420.29
  4. Step 4: Simplify right side
    774.38x = 449,131.39
  5. Step 5: Solve for x
    x = 449,131.39/774.38
  6. Step 6: Final answer
    x = 579.99

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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.