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Finding the Fourth Proportional to 85,499.90, 128,249.49 and 26,319.50

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Solution

The fourth proportional to 85,499.90, 128,249.49 and 26,319.50 is: 39,479.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,499.90 : 128,249.49 = 26,319.50 : x
  2. Step 2: Convert to fraction form
    85,499.90/128,249.49 = 26,319.50/x
  3. Step 3: Cross multiply
    85,499.90x = 128,249.49 × 26,319.50
  4. Step 4: Simplify right side
    85,499.90x = 3,375,462,452.06
  5. Step 5: Solve for x
    x = 3,375,462,452.06/85,499.90
  6. Step 6: Final answer
    x = 39,479.14

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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.