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Finding the Fourth Proportional to 4.90, 6.77 and 4.78

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Solution

The fourth proportional to 4.90, 6.77 and 4.78 is: 6.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.90 : 6.77 = 4.78 : x
  2. Step 2: Convert to fraction form
    4.90/6.77 = 4.78/x
  3. Step 3: Cross multiply
    4.90x = 6.77 × 4.78
  4. Step 4: Simplify right side
    4.90x = 32.36
  5. Step 5: Solve for x
    x = 32.36/4.90
  6. Step 6: Final answer
    x = 6.60

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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.