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Finding the Fourth Proportional to 134.98, 202.30 and 66.40

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Solution

The fourth proportional to 134.98, 202.30 and 66.40 is: 99.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.98 : 202.30 = 66.40 : x
  2. Step 2: Convert to fraction form
    134.98/202.30 = 66.40/x
  3. Step 3: Cross multiply
    134.98x = 202.30 × 66.40
  4. Step 4: Simplify right side
    134.98x = 13,432.72
  5. Step 5: Solve for x
    x = 13,432.72/134.98
  6. Step 6: Final answer
    x = 99.52

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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.