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Finding the Fourth Proportional to 157.15, 235.76 and 47.47

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Solution

The fourth proportional to 157.15, 235.76 and 47.47 is: 71.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.15 : 235.76 = 47.47 : x
  2. Step 2: Convert to fraction form
    157.15/235.76 = 47.47/x
  3. Step 3: Cross multiply
    157.15x = 235.76 × 47.47
  4. Step 4: Simplify right side
    157.15x = 11,191.53
  5. Step 5: Solve for x
    x = 11,191.53/157.15
  6. Step 6: Final answer
    x = 71.22

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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.