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Finding the Fourth Proportional to 21,875.91, 32,814.13 and 8,720.61

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Solution

The fourth proportional to 21,875.91, 32,814.13 and 8,720.61 is: 13,081.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,875.91 : 32,814.13 = 8,720.61 : x
  2. Step 2: Convert to fraction form
    21,875.91/32,814.13 = 8,720.61/x
  3. Step 3: Cross multiply
    21,875.91x = 32,814.13 × 8,720.61
  4. Step 4: Simplify right side
    21,875.91x = 286,159,230.22
  5. Step 5: Solve for x
    x = 286,159,230.22/21,875.91
  6. Step 6: Final answer
    x = 13,081.02

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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.