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Finding the Fourth Proportional to 113.47, 156.59 and 61.72

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Solution

The fourth proportional to 113.47, 156.59 and 61.72 is: 85.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.47 : 156.59 = 61.72 : x
  2. Step 2: Convert to fraction form
    113.47/156.59 = 61.72/x
  3. Step 3: Cross multiply
    113.47x = 156.59 × 61.72
  4. Step 4: Simplify right side
    113.47x = 9,664.58
  5. Step 5: Solve for x
    x = 9,664.58/113.47
  6. Step 6: Final answer
    x = 85.17

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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.