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Finding the Fourth Proportional to 98.40, 147.48 and 47.05

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Solution

The fourth proportional to 98.40, 147.48 and 47.05 is: 70.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.40 : 147.48 = 47.05 : x
  2. Step 2: Convert to fraction form
    98.40/147.48 = 47.05/x
  3. Step 3: Cross multiply
    98.40x = 147.48 × 47.05
  4. Step 4: Simplify right side
    98.40x = 6,938.93
  5. Step 5: Solve for x
    x = 6,938.93/98.40
  6. Step 6: Final answer
    x = 70.52

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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.