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Finding the Fourth Proportional to 18,812.40, 28,218.60 and 7,124.10

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Solution

The fourth proportional to 18,812.40, 28,218.60 and 7,124.10 is: 10,686.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,812.40 : 28,218.60 = 7,124.10 : x
  2. Step 2: Convert to fraction form
    18,812.40/28,218.60 = 7,124.10/x
  3. Step 3: Cross multiply
    18,812.40x = 28,218.60 × 7,124.10
  4. Step 4: Simplify right side
    18,812.40x = 201,032,128.26
  5. Step 5: Solve for x
    x = 201,032,128.26/18,812.40
  6. Step 6: Final answer
    x = 10,686.15

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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.