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Finding the Fourth Proportional to 156.74, 236.32 and 145.40

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Solution

The fourth proportional to 156.74, 236.32 and 145.40 is: 219.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.74 : 236.32 = 145.40 : x
  2. Step 2: Convert to fraction form
    156.74/236.32 = 145.40/x
  3. Step 3: Cross multiply
    156.74x = 236.32 × 145.40
  4. Step 4: Simplify right side
    156.74x = 34,359.38
  5. Step 5: Solve for x
    x = 34,359.38/156.74
  6. Step 6: Final answer
    x = 219.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.