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Finding the Fourth Proportional to 141.49, 212.15 and 72

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Solution

The fourth proportional to 141.49, 212.15 and 72 is: 107.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.49 : 212.15 = 72 : x
  2. Step 2: Convert to fraction form
    141.49/212.15 = 72/x
  3. Step 3: Cross multiply
    141.49x = 212.15 × 72
  4. Step 4: Simplify right side
    141.49x = 15,274.80
  5. Step 5: Solve for x
    x = 15,274.80/141.49
  6. Step 6: Final answer
    x = 107.96

Related Problems

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1.5x scale

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.