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Finding the Fourth Proportional to 151.55, 208.60 and 139.60

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Solution

The fourth proportional to 151.55, 208.60 and 139.60 is: 192.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.55 : 208.60 = 139.60 : x
  2. Step 2: Convert to fraction form
    151.55/208.60 = 139.60/x
  3. Step 3: Cross multiply
    151.55x = 208.60 × 139.60
  4. Step 4: Simplify right side
    151.55x = 29,119.69
  5. Step 5: Solve for x
    x = 29,119.69/151.55
  6. Step 6: Final answer
    x = 192.15

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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.