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Finding the Fourth Proportional to 65,448.99, 90,317.18 and 39,997.95

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Solution

The fourth proportional to 65,448.99, 90,317.18 and 39,997.95 is: 55,195.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,448.99 : 90,317.18 = 39,997.95 : x
  2. Step 2: Convert to fraction form
    65,448.99/90,317.18 = 39,997.95/x
  3. Step 3: Cross multiply
    65,448.99x = 90,317.18 × 39,997.95
  4. Step 4: Simplify right side
    65,448.99x = 3,612,501,849.79
  5. Step 5: Solve for x
    x = 3,612,501,849.79/65,448.99
  6. Step 6: Final answer
    x = 55,195.69

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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.