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Finding the Fourth Proportional to 113.51, 170.25 and 87.99

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Solution

The fourth proportional to 113.51, 170.25 and 87.99 is: 131.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.51 : 170.25 = 87.99 : x
  2. Step 2: Convert to fraction form
    113.51/170.25 = 87.99/x
  3. Step 3: Cross multiply
    113.51x = 170.25 × 87.99
  4. Step 4: Simplify right side
    113.51x = 14,980.30
  5. Step 5: Solve for x
    x = 14,980.30/113.51
  6. Step 6: Final answer
    x = 131.98

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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.