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Finding the Fourth Proportional to 21,613.60, 32,434.80 and 9,920.80

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Solution

The fourth proportional to 21,613.60, 32,434.80 and 9,920.80 is: 14,887.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,613.60 : 32,434.80 = 9,920.80 : x
  2. Step 2: Convert to fraction form
    21,613.60/32,434.80 = 9,920.80/x
  3. Step 3: Cross multiply
    21,613.60x = 32,434.80 × 9,920.80
  4. Step 4: Simplify right side
    21,613.60x = 321,779,163.84
  5. Step 5: Solve for x
    x = 321,779,163.84/21,613.60
  6. Step 6: Final answer
    x = 14,887.81

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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.