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Finding the Fourth Proportional to 157,138.80, 216,845.04 and 85,518.96

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Solution

The fourth proportional to 157,138.80, 216,845.04 and 85,518.96 is: 118,012.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,138.80 : 216,845.04 = 85,518.96 : x
  2. Step 2: Convert to fraction form
    157,138.80/216,845.04 = 85,518.96/x
  3. Step 3: Cross multiply
    157,138.80x = 216,845.04 × 85,518.96
  4. Step 4: Simplify right side
    157,138.80x = 18,544,362,301.96
  5. Step 5: Solve for x
    x = 18,544,362,301.96/157,138.80
  6. Step 6: Final answer
    x = 118,012.63

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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.