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Finding the Fourth Proportional to 156.47, 215.90 and 112.29

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Solution

The fourth proportional to 156.47, 215.90 and 112.29 is: 154.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.47 : 215.90 = 112.29 : x
  2. Step 2: Convert to fraction form
    156.47/215.90 = 112.29/x
  3. Step 3: Cross multiply
    156.47x = 215.90 × 112.29
  4. Step 4: Simplify right side
    156.47x = 24,242.46
  5. Step 5: Solve for x
    x = 24,242.46/156.47
  6. Step 6: Final answer
    x = 154.94

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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.