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Finding the Fourth Proportional to 115.61, 172.14 and 115.10

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Solution

The fourth proportional to 115.61, 172.14 and 115.10 is: 171.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.61 : 172.14 = 115.10 : x
  2. Step 2: Convert to fraction form
    115.61/172.14 = 115.10/x
  3. Step 3: Cross multiply
    115.61x = 172.14 × 115.10
  4. Step 4: Simplify right side
    115.61x = 19,812.74
  5. Step 5: Solve for x
    x = 19,812.74/115.61
  6. Step 6: Final answer
    x = 171.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.