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Finding the Fourth Proportional to 87,136, 130,704 and 21,472

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Solution

The fourth proportional to 87,136, 130,704 and 21,472 is: 32,208

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,136 : 130,704 = 21,472 : x
  2. Step 2: Convert to fraction form
    87,136/130,704 = 21,472/x
  3. Step 3: Cross multiply
    87,136x = 130,704 × 21,472
  4. Step 4: Simplify right side
    87,136x = 2,806,476,288
  5. Step 5: Solve for x
    x = 2,806,476,288/87,136
  6. Step 6: Final answer
    x = 32,208

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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.