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Finding the Fourth Proportional to 43.40, 61.21 and 43.40

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Solution

The fourth proportional to 43.40, 61.21 and 43.40 is: 61.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.40 : 61.21 = 43.40 : x
  2. Step 2: Convert to fraction form
    43.40/61.21 = 43.40/x
  3. Step 3: Cross multiply
    43.40x = 61.21 × 43.40
  4. Step 4: Simplify right side
    43.40x = 2,656.51
  5. Step 5: Solve for x
    x = 2,656.51/43.40
  6. Step 6: Final answer
    x = 61.21

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.