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Finding the Fourth Proportional to 113.32, 156.40 and 64.20

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Solution

The fourth proportional to 113.32, 156.40 and 64.20 is: 88.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.32 : 156.40 = 64.20 : x
  2. Step 2: Convert to fraction form
    113.32/156.40 = 64.20/x
  3. Step 3: Cross multiply
    113.32x = 156.40 × 64.20
  4. Step 4: Simplify right side
    113.32x = 10,040.72
  5. Step 5: Solve for x
    x = 10,040.72/113.32
  6. Step 6: Final answer
    x = 88.61

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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.