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Finding the Fourth Proportional to 98.31, 147.40 and 46.98

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Solution

The fourth proportional to 98.31, 147.40 and 46.98 is: 70.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.31 : 147.40 = 46.98 : x
  2. Step 2: Convert to fraction form
    98.31/147.40 = 46.98/x
  3. Step 3: Cross multiply
    98.31x = 147.40 × 46.98
  4. Step 4: Simplify right side
    98.31x = 6,924.73
  5. Step 5: Solve for x
    x = 6,924.73/98.31
  6. Step 6: Final answer
    x = 70.44

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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.