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Finding the Fourth Proportional to 113.22, 156.06 and 78.30

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Solution

The fourth proportional to 113.22, 156.06 and 78.30 is: 107.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.22 : 156.06 = 78.30 : x
  2. Step 2: Convert to fraction form
    113.22/156.06 = 78.30/x
  3. Step 3: Cross multiply
    113.22x = 156.06 × 78.30
  4. Step 4: Simplify right side
    113.22x = 12,219.50
  5. Step 5: Solve for x
    x = 12,219.50/113.22
  6. Step 6: Final answer
    x = 107.93

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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.