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Finding the Fourth Proportional to 100,646.80, 138,889.64 and 57,624.84

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Solution

The fourth proportional to 100,646.80, 138,889.64 and 57,624.84 is: 79,520.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,646.80 : 138,889.64 = 57,624.84 : x
  2. Step 2: Convert to fraction form
    100,646.80/138,889.64 = 57,624.84/x
  3. Step 3: Cross multiply
    100,646.80x = 138,889.64 × 57,624.84
  4. Step 4: Simplify right side
    100,646.80x = 8,003,493,282.66
  5. Step 5: Solve for x
    x = 8,003,493,282.66/100,646.80
  6. Step 6: Final answer
    x = 79,520.59

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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.