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Finding the Fourth Proportional to 83,490.72, 125,039.26 and 64,619.64

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Solution

The fourth proportional to 83,490.72, 125,039.26 and 64,619.64 is: 96,777.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,490.72 : 125,039.26 = 64,619.64 : x
  2. Step 2: Convert to fraction form
    83,490.72/125,039.26 = 64,619.64/x
  3. Step 3: Cross multiply
    83,490.72x = 125,039.26 × 64,619.64
  4. Step 4: Simplify right side
    83,490.72x = 8,079,991,967.07
  5. Step 5: Solve for x
    x = 8,079,991,967.07/83,490.72
  6. Step 6: Final answer
    x = 96,777.13

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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.