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Finding the Fourth Proportional to 157,720.86, 217,653.64 and 86,100.86

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Solution

The fourth proportional to 157,720.86, 217,653.64 and 86,100.86 is: 118,818.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,720.86 : 217,653.64 = 86,100.86 : x
  2. Step 2: Convert to fraction form
    157,720.86/217,653.64 = 86,100.86/x
  3. Step 3: Cross multiply
    157,720.86x = 217,653.64 × 86,100.86
  4. Step 4: Simplify right side
    157,720.86x = 18,740,165,586.13
  5. Step 5: Solve for x
    x = 18,740,165,586.13/157,720.86
  6. Step 6: Final answer
    x = 118,818.56

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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.