Home / 100,741.20-138,961.62-72,485.16

Finding the Fourth Proportional to 100,741.20, 138,961.62 and 72,485.16

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Solution

The fourth proportional to 100,741.20, 138,961.62 and 72,485.16 is: 99,985.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,741.20 : 138,961.62 = 72,485.16 : x
  2. Step 2: Convert to fraction form
    100,741.20/138,961.62 = 72,485.16/x
  3. Step 3: Cross multiply
    100,741.20x = 138,961.62 × 72,485.16
  4. Step 4: Simplify right side
    100,741.20x = 10,072,655,259.56
  5. Step 5: Solve for x
    x = 10,072,655,259.56/100,741.20
  6. Step 6: Final answer
    x = 99,985.46

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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.