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Finding the Fourth Proportional to 150.28, 207.40 and 84.78

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Solution

The fourth proportional to 150.28, 207.40 and 84.78 is: 117.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.28 : 207.40 = 84.78 : x
  2. Step 2: Convert to fraction form
    150.28/207.40 = 84.78/x
  3. Step 3: Cross multiply
    150.28x = 207.40 × 84.78
  4. Step 4: Simplify right side
    150.28x = 17,583.37
  5. Step 5: Solve for x
    x = 17,583.37/150.28
  6. Step 6: Final answer
    x = 117.00

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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.