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Finding the Fourth Proportional to 21,421.60, 32,122.80 and 9,728.80

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Solution

The fourth proportional to 21,421.60, 32,122.80 and 9,728.80 is: 14,588.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,421.60 : 32,122.80 = 9,728.80 : x
  2. Step 2: Convert to fraction form
    21,421.60/32,122.80 = 9,728.80/x
  3. Step 3: Cross multiply
    21,421.60x = 32,122.80 × 9,728.80
  4. Step 4: Simplify right side
    21,421.60x = 312,516,296.64
  5. Step 5: Solve for x
    x = 312,516,296.64/21,421.60
  6. Step 6: Final answer
    x = 14,588.84

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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.