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Finding the Fourth Proportional to 157.86, 217.80 and 135.90

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Solution

The fourth proportional to 157.86, 217.80 and 135.90 is: 187.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.86 : 217.80 = 135.90 : x
  2. Step 2: Convert to fraction form
    157.86/217.80 = 135.90/x
  3. Step 3: Cross multiply
    157.86x = 217.80 × 135.90
  4. Step 4: Simplify right side
    157.86x = 29,599.02
  5. Step 5: Solve for x
    x = 29,599.02/157.86
  6. Step 6: Final answer
    x = 187.50

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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.