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Finding the Fourth Proportional to 113.66, 156.38 and 89.06

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Solution

The fourth proportional to 113.66, 156.38 and 89.06 is: 122.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.66 : 156.38 = 89.06 : x
  2. Step 2: Convert to fraction form
    113.66/156.38 = 89.06/x
  3. Step 3: Cross multiply
    113.66x = 156.38 × 89.06
  4. Step 4: Simplify right side
    113.66x = 13,925.98
  5. Step 5: Solve for x
    x = 13,925.98/113.66
  6. Step 6: Final answer
    x = 122.53

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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.