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Finding the Fourth Proportional to 18,918.40, 28,393.80 and 8,404.60

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Solution

The fourth proportional to 18,918.40, 28,393.80 and 8,404.60 is: 12,614.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.40 : 28,393.80 = 8,404.60 : x
  2. Step 2: Convert to fraction form
    18,918.40/28,393.80 = 8,404.60/x
  3. Step 3: Cross multiply
    18,918.40x = 28,393.80 × 8,404.60
  4. Step 4: Simplify right side
    18,918.40x = 238,638,531.48
  5. Step 5: Solve for x
    x = 238,638,531.48/18,918.40
  6. Step 6: Final answer
    x = 12,614.10

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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.