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Finding the Fourth Proportional to 18,827.40, 28,241.10 and 7,139.10

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Solution

The fourth proportional to 18,827.40, 28,241.10 and 7,139.10 is: 10,708.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,827.40 : 28,241.10 = 7,139.10 : x
  2. Step 2: Convert to fraction form
    18,827.40/28,241.10 = 7,139.10/x
  3. Step 3: Cross multiply
    18,827.40x = 28,241.10 × 7,139.10
  4. Step 4: Simplify right side
    18,827.40x = 201,616,037.01
  5. Step 5: Solve for x
    x = 201,616,037.01/18,827.40
  6. Step 6: Final answer
    x = 10,708.65

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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.