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Finding the Fourth Proportional to 100,487.92, 138,644.94 and 64,698.64

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Solution

The fourth proportional to 100,487.92, 138,644.94 and 64,698.64 is: 89,265.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,487.92 : 138,644.94 = 64,698.64 : x
  2. Step 2: Convert to fraction form
    100,487.92/138,644.94 = 64,698.64/x
  3. Step 3: Cross multiply
    100,487.92x = 138,644.94 × 64,698.64
  4. Step 4: Simplify right side
    100,487.92x = 8,970,139,060.88
  5. Step 5: Solve for x
    x = 8,970,139,060.88/100,487.92
  6. Step 6: Final answer
    x = 89,265.84

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1.5x scale

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.