Home / 21,136.49-31,718.57-7,988.87

Finding the Fourth Proportional to 21,136.49, 31,718.57 and 7,988.87

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Solution

The fourth proportional to 21,136.49, 31,718.57 and 7,988.87 is: 11,988.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.49 : 31,718.57 = 7,988.87 : x
  2. Step 2: Convert to fraction form
    21,136.49/31,718.57 = 7,988.87/x
  3. Step 3: Cross multiply
    21,136.49x = 31,718.57 × 7,988.87
  4. Step 4: Simplify right side
    21,136.49x = 253,395,333.78
  5. Step 5: Solve for x
    x = 253,395,333.78/21,136.49
  6. Step 6: Final answer
    x = 11,988.53

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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.