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Finding the Fourth Proportional to 18,281.60, 27,428.80 and 7,900.80

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Solution

The fourth proportional to 18,281.60, 27,428.80 and 7,900.80 is: 11,853.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,281.60 : 27,428.80 = 7,900.80 : x
  2. Step 2: Convert to fraction form
    18,281.60/27,428.80 = 7,900.80/x
  3. Step 3: Cross multiply
    18,281.60x = 27,428.80 × 7,900.80
  4. Step 4: Simplify right side
    18,281.60x = 216,709,463.04
  5. Step 5: Solve for x
    x = 216,709,463.04/18,281.60
  6. Step 6: Final answer
    x = 11,853.97

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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.