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Finding the Fourth Proportional to 153.84, 212.40 and 124.80

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Solution

The fourth proportional to 153.84, 212.40 and 124.80 is: 172.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.84 : 212.40 = 124.80 : x
  2. Step 2: Convert to fraction form
    153.84/212.40 = 124.80/x
  3. Step 3: Cross multiply
    153.84x = 212.40 × 124.80
  4. Step 4: Simplify right side
    153.84x = 26,507.52
  5. Step 5: Solve for x
    x = 26,507.52/153.84
  6. Step 6: Final answer
    x = 172.31

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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.