Home / 21,715.80-29,971.01-13,758.76

Finding the Fourth Proportional to 21,715.80, 29,971.01 and 13,758.76

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Solution

The fourth proportional to 21,715.80, 29,971.01 and 13,758.76 is: 18,989.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,715.80 : 29,971.01 = 13,758.76 : x
  2. Step 2: Convert to fraction form
    21,715.80/29,971.01 = 13,758.76/x
  3. Step 3: Cross multiply
    21,715.80x = 29,971.01 × 13,758.76
  4. Step 4: Simplify right side
    21,715.80x = 412,364,005.41
  5. Step 5: Solve for x
    x = 412,364,005.41/21,715.80
  6. Step 6: Final answer
    x = 18,989.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.