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Finding the Fourth Proportional to 56.70, 84.98 and 43.20

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Solution

The fourth proportional to 56.70, 84.98 and 43.20 is: 64.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.70 : 84.98 = 43.20 : x
  2. Step 2: Convert to fraction form
    56.70/84.98 = 43.20/x
  3. Step 3: Cross multiply
    56.70x = 84.98 × 43.20
  4. Step 4: Simplify right side
    56.70x = 3,671.14
  5. Step 5: Solve for x
    x = 3,671.14/56.70
  6. Step 6: Final answer
    x = 64.75

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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.