Home / 20,516.40-28,315.94-15,486.30

Finding the Fourth Proportional to 20,516.40, 28,315.94 and 15,486.30

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Solution

The fourth proportional to 20,516.40, 28,315.94 and 15,486.30 is: 21,373.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,516.40 : 28,315.94 = 15,486.30 : x
  2. Step 2: Convert to fraction form
    20,516.40/28,315.94 = 15,486.30/x
  3. Step 3: Cross multiply
    20,516.40x = 28,315.94 × 15,486.30
  4. Step 4: Simplify right side
    20,516.40x = 438,509,064.19
  5. Step 5: Solve for x
    x = 438,509,064.19/20,516.40
  6. Step 6: Final answer
    x = 21,373.59

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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.