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Finding the Fourth Proportional to 18,808.40, 28,212.60 and 10,038.80

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Solution

The fourth proportional to 18,808.40, 28,212.60 and 10,038.80 is: 15,058.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.40 : 28,212.60 = 10,038.80 : x
  2. Step 2: Convert to fraction form
    18,808.40/28,212.60 = 10,038.80/x
  3. Step 3: Cross multiply
    18,808.40x = 28,212.60 × 10,038.80
  4. Step 4: Simplify right side
    18,808.40x = 283,220,648.88
  5. Step 5: Solve for x
    x = 283,220,648.88/18,808.40
  6. Step 6: Final answer
    x = 15,058.20

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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.