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Finding the Fourth Proportional to 21,388.94, 32,061.87 and 8,915.87

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Solution

The fourth proportional to 21,388.94, 32,061.87 and 8,915.87 is: 13,364.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,388.94 : 32,061.87 = 8,915.87 : x
  2. Step 2: Convert to fraction form
    21,388.94/32,061.87 = 8,915.87/x
  3. Step 3: Cross multiply
    21,388.94x = 32,061.87 × 8,915.87
  4. Step 4: Simplify right side
    21,388.94x = 285,859,259.99
  5. Step 5: Solve for x
    x = 285,859,259.99/21,388.94
  6. Step 6: Final answer
    x = 13,364.82

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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.