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Finding the Fourth Proportional to 678.05, 934.94 and 553.32

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Solution

The fourth proportional to 678.05, 934.94 and 553.32 is: 762.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.05 : 934.94 = 553.32 : x
  2. Step 2: Convert to fraction form
    678.05/934.94 = 553.32/x
  3. Step 3: Cross multiply
    678.05x = 934.94 × 553.32
  4. Step 4: Simplify right side
    678.05x = 517,321.95
  5. Step 5: Solve for x
    x = 517,321.95/678.05
  6. Step 6: Final answer
    x = 762.95

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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.