Home / 21,136.40-31,718.43-7,988.77

Finding the Fourth Proportional to 21,136.40, 31,718.43 and 7,988.77

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Solution

The fourth proportional to 21,136.40, 31,718.43 and 7,988.77 is: 11,988.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.40 : 31,718.43 = 7,988.77 : x
  2. Step 2: Convert to fraction form
    21,136.40/31,718.43 = 7,988.77/x
  3. Step 3: Cross multiply
    21,136.40x = 31,718.43 × 7,988.77
  4. Step 4: Simplify right side
    21,136.40x = 253,391,162.74
  5. Step 5: Solve for x
    x = 253,391,162.74/21,136.40
  6. Step 6: Final answer
    x = 11,988.38

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1.5x scale

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.