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Finding the Fourth Proportional to 18,325.80, 27,488.70 and 12,420.90

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Solution

The fourth proportional to 18,325.80, 27,488.70 and 12,420.90 is: 18,631.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,325.80 : 27,488.70 = 12,420.90 : x
  2. Step 2: Convert to fraction form
    18,325.80/27,488.70 = 12,420.90/x
  3. Step 3: Cross multiply
    18,325.80x = 27,488.70 × 12,420.90
  4. Step 4: Simplify right side
    18,325.80x = 341,434,393.83
  5. Step 5: Solve for x
    x = 341,434,393.83/18,325.80
  6. Step 6: Final answer
    x = 18,631.35

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Similar ratio
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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.