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Finding the Fourth Proportional to 21,663.75, 32,490.63 and 6,869.91

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Solution

The fourth proportional to 21,663.75, 32,490.63 and 6,869.91 is: 10,303.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,663.75 : 32,490.63 = 6,869.91 : x
  2. Step 2: Convert to fraction form
    21,663.75/32,490.63 = 6,869.91/x
  3. Step 3: Cross multiply
    21,663.75x = 32,490.63 × 6,869.91
  4. Step 4: Simplify right side
    21,663.75x = 223,207,703.94
  5. Step 5: Solve for x
    x = 223,207,703.94/21,663.75
  6. Step 6: Final answer
    x = 10,303.28

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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.