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Finding the Fourth Proportional to 99.51, 149.30 and 51.38

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Solution

The fourth proportional to 99.51, 149.30 and 51.38 is: 77.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.51 : 149.30 = 51.38 : x
  2. Step 2: Convert to fraction form
    99.51/149.30 = 51.38/x
  3. Step 3: Cross multiply
    99.51x = 149.30 × 51.38
  4. Step 4: Simplify right side
    99.51x = 7,670.03
  5. Step 5: Solve for x
    x = 7,670.03/99.51
  6. Step 6: Final answer
    x = 77.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.