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Finding the Fourth Proportional to 113.70, 156.87 and 64.56

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Solution

The fourth proportional to 113.70, 156.87 and 64.56 is: 89.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.70 : 156.87 = 64.56 : x
  2. Step 2: Convert to fraction form
    113.70/156.87 = 64.56/x
  3. Step 3: Cross multiply
    113.70x = 156.87 × 64.56
  4. Step 4: Simplify right side
    113.70x = 10,127.53
  5. Step 5: Solve for x
    x = 10,127.53/113.70
  6. Step 6: Final answer
    x = 89.07

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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.