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Finding the Fourth Proportional to 18,937.40, 28,406.16 and 5,789.72

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Solution

The fourth proportional to 18,937.40, 28,406.16 and 5,789.72 is: 8,684.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,937.40 : 28,406.16 = 5,789.72 : x
  2. Step 2: Convert to fraction form
    18,937.40/28,406.16 = 5,789.72/x
  3. Step 3: Cross multiply
    18,937.40x = 28,406.16 × 5,789.72
  4. Step 4: Simplify right side
    18,937.40x = 164,463,712.68
  5. Step 5: Solve for x
    x = 164,463,712.68/18,937.40
  6. Step 6: Final answer
    x = 8,684.60

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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.