Home / 100,439.02-138,606.96-55,115.72

Finding the Fourth Proportional to 100,439.02, 138,606.96 and 55,115.72

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Solution

The fourth proportional to 100,439.02, 138,606.96 and 55,115.72 is: 76,060.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,439.02 : 138,606.96 = 55,115.72 : x
  2. Step 2: Convert to fraction form
    100,439.02/138,606.96 = 55,115.72/x
  3. Step 3: Cross multiply
    100,439.02x = 138,606.96 × 55,115.72
  4. Step 4: Simplify right side
    100,439.02x = 7,639,422,397.41
  5. Step 5: Solve for x
    x = 7,639,422,397.41/100,439.02
  6. Step 6: Final answer
    x = 76,060.30

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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.