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Finding the Fourth Proportional to 150.40, 207.58 and 138.10

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Solution

The fourth proportional to 150.40, 207.58 and 138.10 is: 190.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.40 : 207.58 = 138.10 : x
  2. Step 2: Convert to fraction form
    150.40/207.58 = 138.10/x
  3. Step 3: Cross multiply
    150.40x = 207.58 × 138.10
  4. Step 4: Simplify right side
    150.40x = 28,666.80
  5. Step 5: Solve for x
    x = 28,666.80/150.40
  6. Step 6: Final answer
    x = 190.60

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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.