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Finding the Fourth Proportional to 156.72, 235.06 and 91.51

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Solution

The fourth proportional to 156.72, 235.06 and 91.51 is: 137.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.72 : 235.06 = 91.51 : x
  2. Step 2: Convert to fraction form
    156.72/235.06 = 91.51/x
  3. Step 3: Cross multiply
    156.72x = 235.06 × 91.51
  4. Step 4: Simplify right side
    156.72x = 21,509.88
  5. Step 5: Solve for x
    x = 21,509.88/156.72
  6. Step 6: Final answer
    x = 137.25

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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.