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Finding the Fourth Proportional to 66, 98.90 and 43.19

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Solution

The fourth proportional to 66, 98.90 and 43.19 is: 64.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66 : 98.90 = 43.19 : x
  2. Step 2: Convert to fraction form
    66/98.90 = 43.19/x
  3. Step 3: Cross multiply
    66x = 98.90 × 43.19
  4. Step 4: Simplify right side
    66x = 4,271.49
  5. Step 5: Solve for x
    x = 4,271.49/66
  6. Step 6: Final answer
    x = 64.72

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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.