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Finding the Fourth Proportional to 18,859.72, 28,289.63 and 5,712.20

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Solution

The fourth proportional to 18,859.72, 28,289.63 and 5,712.20 is: 8,568.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,859.72 : 28,289.63 = 5,712.20 : x
  2. Step 2: Convert to fraction form
    18,859.72/28,289.63 = 5,712.20/x
  3. Step 3: Cross multiply
    18,859.72x = 28,289.63 × 5,712.20
  4. Step 4: Simplify right side
    18,859.72x = 161,596,066.65
  5. Step 5: Solve for x
    x = 161,596,066.65/18,859.72
  6. Step 6: Final answer
    x = 8,568.32

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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.