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Finding the Fourth Proportional to 18,993.68, 28,490.16 and 5,142.72

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Solution

The fourth proportional to 18,993.68, 28,490.16 and 5,142.72 is: 7,713.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.68 : 28,490.16 = 5,142.72 : x
  2. Step 2: Convert to fraction form
    18,993.68/28,490.16 = 5,142.72/x
  3. Step 3: Cross multiply
    18,993.68x = 28,490.16 × 5,142.72
  4. Step 4: Simplify right side
    18,993.68x = 146,516,915.64
  5. Step 5: Solve for x
    x = 146,516,915.64/18,993.68
  6. Step 6: Final answer
    x = 7,713.98

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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.