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Finding the Fourth Proportional to 104.03, 156.21 and 78.51

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Solution

The fourth proportional to 104.03, 156.21 and 78.51 is: 117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.03 : 156.21 = 78.51 : x
  2. Step 2: Convert to fraction form
    104.03/156.21 = 78.51/x
  3. Step 3: Cross multiply
    104.03x = 156.21 × 78.51
  4. Step 4: Simplify right side
    104.03x = 12,264.05
  5. Step 5: Solve for x
    x = 12,264.05/104.03
  6. Step 6: Final answer
    x = 117.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.