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Finding the Fourth Proportional to 113.46, 156.56 and 64.32

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Solution

The fourth proportional to 113.46, 156.56 and 64.32 is: 88.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.46 : 156.56 = 64.32 : x
  2. Step 2: Convert to fraction form
    113.46/156.56 = 64.32/x
  3. Step 3: Cross multiply
    113.46x = 156.56 × 64.32
  4. Step 4: Simplify right side
    113.46x = 10,069.62
  5. Step 5: Solve for x
    x = 10,069.62/113.46
  6. Step 6: Final answer
    x = 88.75

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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.