Home / 20,700.23-28,511.90-15,911.01

Finding the Fourth Proportional to 20,700.23, 28,511.90 and 15,911.01

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Solution

The fourth proportional to 20,700.23, 28,511.90 and 15,911.01 is: 21,915.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.23 : 28,511.90 = 15,911.01 : x
  2. Step 2: Convert to fraction form
    20,700.23/28,511.90 = 15,911.01/x
  3. Step 3: Cross multiply
    20,700.23x = 28,511.90 × 15,911.01
  4. Step 4: Simplify right side
    20,700.23x = 453,653,046.46
  5. Step 5: Solve for x
    x = 453,653,046.46/20,700.23
  6. Step 6: Final answer
    x = 21,915.37

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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.