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Finding the Fourth Proportional to 150.64, 207.86 and 85.15

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Solution

The fourth proportional to 150.64, 207.86 and 85.15 is: 117.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.64 : 207.86 = 85.15 : x
  2. Step 2: Convert to fraction form
    150.64/207.86 = 85.15/x
  3. Step 3: Cross multiply
    150.64x = 207.86 × 85.15
  4. Step 4: Simplify right side
    150.64x = 17,697.81
  5. Step 5: Solve for x
    x = 17,697.81/150.64
  6. Step 6: Final answer
    x = 117.49

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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.