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Finding the Fourth Proportional to 14,508.60, 20,021.70 and 8,221.20

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Solution

The fourth proportional to 14,508.60, 20,021.70 and 8,221.20 is: 11,345.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,508.60 : 20,021.70 = 8,221.20 : x
  2. Step 2: Convert to fraction form
    14,508.60/20,021.70 = 8,221.20/x
  3. Step 3: Cross multiply
    14,508.60x = 20,021.70 × 8,221.20
  4. Step 4: Simplify right side
    14,508.60x = 164,602,400.04
  5. Step 5: Solve for x
    x = 164,602,400.04/14,508.60
  6. Step 6: Final answer
    x = 11,345.16

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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.