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Finding the Fourth Proportional to 157,239.23, 216,992.72 and 85,620.65

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Solution

The fourth proportional to 157,239.23, 216,992.72 and 85,620.65 is: 118,157.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,239.23 : 216,992.72 = 85,620.65 : x
  2. Step 2: Convert to fraction form
    157,239.23/216,992.72 = 85,620.65/x
  3. Step 3: Cross multiply
    157,239.23x = 216,992.72 × 85,620.65
  4. Step 4: Simplify right side
    157,239.23x = 18,579,056,860.76
  5. Step 5: Solve for x
    x = 18,579,056,860.76/157,239.23
  6. Step 6: Final answer
    x = 118,157.90

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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.