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Finding the Fourth Proportional to 160.86, 221.40 and 142.50

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Solution

The fourth proportional to 160.86, 221.40 and 142.50 is: 196.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.86 : 221.40 = 142.50 : x
  2. Step 2: Convert to fraction form
    160.86/221.40 = 142.50/x
  3. Step 3: Cross multiply
    160.86x = 221.40 × 142.50
  4. Step 4: Simplify right side
    160.86x = 31,549.50
  5. Step 5: Solve for x
    x = 31,549.50/160.86
  6. Step 6: Final answer
    x = 196.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.