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Finding the Fourth Proportional to 113.24, 156.10 and 85.64

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Solution

The fourth proportional to 113.24, 156.10 and 85.64 is: 118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.24 : 156.10 = 85.64 : x
  2. Step 2: Convert to fraction form
    113.24/156.10 = 85.64/x
  3. Step 3: Cross multiply
    113.24x = 156.10 × 85.64
  4. Step 4: Simplify right side
    113.24x = 13,368.40
  5. Step 5: Solve for x
    x = 13,368.40/113.24
  6. Step 6: Final answer
    x = 118.05

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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.