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Finding the Fourth Proportional to 559.92, 774.16 and 490.70

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Solution

The fourth proportional to 559.92, 774.16 and 490.70 is: 678.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.92 : 774.16 = 490.70 : x
  2. Step 2: Convert to fraction form
    559.92/774.16 = 490.70/x
  3. Step 3: Cross multiply
    559.92x = 774.16 × 490.70
  4. Step 4: Simplify right side
    559.92x = 379,880.31
  5. Step 5: Solve for x
    x = 379,880.31/559.92
  6. Step 6: Final answer
    x = 678.45

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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.