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Finding the Fourth Proportional to 153.93, 212.73 and 139.08

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Solution

The fourth proportional to 153.93, 212.73 and 139.08 is: 192.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.93 : 212.73 = 139.08 : x
  2. Step 2: Convert to fraction form
    153.93/212.73 = 139.08/x
  3. Step 3: Cross multiply
    153.93x = 212.73 × 139.08
  4. Step 4: Simplify right side
    153.93x = 29,586.49
  5. Step 5: Solve for x
    x = 29,586.49/153.93
  6. Step 6: Final answer
    x = 192.21

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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.