Home / 85,500.10-128,104.35-72,961.30

Finding the Fourth Proportional to 85,500.10, 128,104.35 and 72,961.30

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Solution

The fourth proportional to 85,500.10, 128,104.35 and 72,961.30 is: 109,317.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,500.10 : 128,104.35 = 72,961.30 : x
  2. Step 2: Convert to fraction form
    85,500.10/128,104.35 = 72,961.30/x
  3. Step 3: Cross multiply
    85,500.10x = 128,104.35 × 72,961.30
  4. Step 4: Simplify right side
    85,500.10x = 9,346,659,911.66
  5. Step 5: Solve for x
    x = 9,346,659,911.66/85,500.10
  6. Step 6: Final answer
    x = 109,317.53

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1.5x scale

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.