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Finding the Fourth Proportional to 42.98, 64.60 and 36.70

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Solution

The fourth proportional to 42.98, 64.60 and 36.70 is: 55.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.98 : 64.60 = 36.70 : x
  2. Step 2: Convert to fraction form
    42.98/64.60 = 36.70/x
  3. Step 3: Cross multiply
    42.98x = 64.60 × 36.70
  4. Step 4: Simplify right side
    42.98x = 2,370.57
  5. Step 5: Solve for x
    x = 2,370.57/42.98
  6. Step 6: Final answer
    x = 55.16

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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.