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Finding the Fourth Proportional to 216,408.68, 324,729.66 and 90,136.16

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Solution

The fourth proportional to 216,408.68, 324,729.66 and 90,136.16 is: 135,252.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,408.68 : 324,729.66 = 90,136.16 : x
  2. Step 2: Convert to fraction form
    216,408.68/324,729.66 = 90,136.16/x
  3. Step 3: Cross multiply
    216,408.68x = 324,729.66 × 90,136.16
  4. Step 4: Simplify right side
    216,408.68x = 29,269,884,590.51
  5. Step 5: Solve for x
    x = 29,269,884,590.51/216,408.68
  6. Step 6: Final answer
    x = 135,252.82

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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.