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Finding the Fourth Proportional to 12,488.80, 18,701.88 and 11,305.30

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Solution

The fourth proportional to 12,488.80, 18,701.88 and 11,305.30 is: 16,929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,488.80 : 18,701.88 = 11,305.30 : x
  2. Step 2: Convert to fraction form
    12,488.80/18,701.88 = 11,305.30/x
  3. Step 3: Cross multiply
    12,488.80x = 18,701.88 × 11,305.30
  4. Step 4: Simplify right side
    12,488.80x = 211,430,363.96
  5. Step 5: Solve for x
    x = 211,430,363.96/12,488.80
  6. Step 6: Final answer
    x = 16,929.60

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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.