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Finding the Fourth Proportional to 156.89, 235.42 and 75.74

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Solution

The fourth proportional to 156.89, 235.42 and 75.74 is: 113.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.89 : 235.42 = 75.74 : x
  2. Step 2: Convert to fraction form
    156.89/235.42 = 75.74/x
  3. Step 3: Cross multiply
    156.89x = 235.42 × 75.74
  4. Step 4: Simplify right side
    156.89x = 17,830.71
  5. Step 5: Solve for x
    x = 17,830.71/156.89
  6. Step 6: Final answer
    x = 113.65

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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.