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Finding the Fourth Proportional to 18,827.32, 28,239.36 and 7,140.64

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Solution

The fourth proportional to 18,827.32, 28,239.36 and 7,140.64 is: 10,710.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,827.32 : 28,239.36 = 7,140.64 : x
  2. Step 2: Convert to fraction form
    18,827.32/28,239.36 = 7,140.64/x
  3. Step 3: Cross multiply
    18,827.32x = 28,239.36 × 7,140.64
  4. Step 4: Simplify right side
    18,827.32x = 201,647,103.59
  5. Step 5: Solve for x
    x = 201,647,103.59/18,827.32
  6. Step 6: Final answer
    x = 10,710.35

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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.