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Finding the Fourth Proportional to 153.15, 210.99 and 113.68

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Solution

The fourth proportional to 153.15, 210.99 and 113.68 is: 156.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.15 : 210.99 = 113.68 : x
  2. Step 2: Convert to fraction form
    153.15/210.99 = 113.68/x
  3. Step 3: Cross multiply
    153.15x = 210.99 × 113.68
  4. Step 4: Simplify right side
    153.15x = 23,985.34
  5. Step 5: Solve for x
    x = 23,985.34/153.15
  6. Step 6: Final answer
    x = 156.61

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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.