Home / 20,700.65-28,516.20-15,018.62

Finding the Fourth Proportional to 20,700.65, 28,516.20 and 15,018.62

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Solution

The fourth proportional to 20,700.65, 28,516.20 and 15,018.62 is: 20,688.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.65 : 28,516.20 = 15,018.62 : x
  2. Step 2: Convert to fraction form
    20,700.65/28,516.20 = 15,018.62/x
  3. Step 3: Cross multiply
    20,700.65x = 28,516.20 × 15,018.62
  4. Step 4: Simplify right side
    20,700.65x = 428,273,971.64
  5. Step 5: Solve for x
    x = 428,273,971.64/20,700.65
  6. Step 6: Final answer
    x = 20,688.91

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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.