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Finding the Fourth Proportional to 774.32, 1,068.13 and 553.39

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Solution

The fourth proportional to 774.32, 1,068.13 and 553.39 is: 763.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.32 : 1,068.13 = 553.39 : x
  2. Step 2: Convert to fraction form
    774.32/1,068.13 = 553.39/x
  3. Step 3: Cross multiply
    774.32x = 1,068.13 × 553.39
  4. Step 4: Simplify right side
    774.32x = 591,092.46
  5. Step 5: Solve for x
    x = 591,092.46/774.32
  6. Step 6: Final answer
    x = 763.37

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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.