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Finding the Fourth Proportional to 114.68, 172.17 and 77.99

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Solution

The fourth proportional to 114.68, 172.17 and 77.99 is: 117.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.68 : 172.17 = 77.99 : x
  2. Step 2: Convert to fraction form
    114.68/172.17 = 77.99/x
  3. Step 3: Cross multiply
    114.68x = 172.17 × 77.99
  4. Step 4: Simplify right side
    114.68x = 13,426.68
  5. Step 5: Solve for x
    x = 13,426.68/114.68
  6. Step 6: Final answer
    x = 117.08

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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.