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Finding the Fourth Proportional to 51, 76.90 and 49.08

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Solution

The fourth proportional to 51, 76.90 and 49.08 is: 74.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    51 : 76.90 = 49.08 : x
  2. Step 2: Convert to fraction form
    51/76.90 = 49.08/x
  3. Step 3: Cross multiply
    51x = 76.90 × 49.08
  4. Step 4: Simplify right side
    51x = 3,774.25
  5. Step 5: Solve for x
    x = 3,774.25/51
  6. Step 6: Final answer
    x = 74.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.