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Finding the Fourth Proportional to 211.13, 315.93 and 124.51

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Solution

The fourth proportional to 211.13, 315.93 and 124.51 is: 186.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.13 : 315.93 = 124.51 : x
  2. Step 2: Convert to fraction form
    211.13/315.93 = 124.51/x
  3. Step 3: Cross multiply
    211.13x = 315.93 × 124.51
  4. Step 4: Simplify right side
    211.13x = 39,334.83
  5. Step 5: Solve for x
    x = 39,334.83/211.13
  6. Step 6: Final answer
    x = 186.30

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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.