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Finding the Fourth Proportional to 21,655.91, 32,483.86 and 5,239.91

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Solution

The fourth proportional to 21,655.91, 32,483.86 and 5,239.91 is: 7,859.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.91 : 32,483.86 = 5,239.91 : x
  2. Step 2: Convert to fraction form
    21,655.91/32,483.86 = 5,239.91/x
  3. Step 3: Cross multiply
    21,655.91x = 32,483.86 × 5,239.91
  4. Step 4: Simplify right side
    21,655.91x = 170,212,387.59
  5. Step 5: Solve for x
    x = 170,212,387.59/21,655.91
  6. Step 6: Final answer
    x = 7,859.86

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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.