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Finding the Fourth Proportional to 774.49, 1,068.78 and 442.93

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Solution

The fourth proportional to 774.49, 1,068.78 and 442.93 is: 611.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.49 : 1,068.78 = 442.93 : x
  2. Step 2: Convert to fraction form
    774.49/1,068.78 = 442.93/x
  3. Step 3: Cross multiply
    774.49x = 1,068.78 × 442.93
  4. Step 4: Simplify right side
    774.49x = 473,394.73
  5. Step 5: Solve for x
    x = 473,394.73/774.49
  6. Step 6: Final answer
    x = 611.23

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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.