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Finding the Fourth Proportional to 18,707.70, 28,064.70 and 5,561.40

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Solution

The fourth proportional to 18,707.70, 28,064.70 and 5,561.40 is: 8,343.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.70 : 28,064.70 = 5,561.40 : x
  2. Step 2: Convert to fraction form
    18,707.70/28,064.70 = 5,561.40/x
  3. Step 3: Cross multiply
    18,707.70x = 28,064.70 × 5,561.40
  4. Step 4: Simplify right side
    18,707.70x = 156,079,022.58
  5. Step 5: Solve for x
    x = 156,079,022.58/18,707.70
  6. Step 6: Final answer
    x = 8,343.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.