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Finding the Fourth Proportional to 20,715.81, 28,589.81 and 12,762.69

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Solution

The fourth proportional to 20,715.81, 28,589.81 and 12,762.69 is: 17,613.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.81 : 28,589.81 = 12,762.69 : x
  2. Step 2: Convert to fraction form
    20,715.81/28,589.81 = 12,762.69/x
  3. Step 3: Cross multiply
    20,715.81x = 28,589.81 × 12,762.69
  4. Step 4: Simplify right side
    20,715.81x = 364,882,818.38
  5. Step 5: Solve for x
    x = 364,882,818.38/20,715.81
  6. Step 6: Final answer
    x = 17,613.74

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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.