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Finding the Fourth Proportional to 18,285.60, 27,428.40 and 15,661.20

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Solution

The fourth proportional to 18,285.60, 27,428.40 and 15,661.20 is: 23,491.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,285.60 : 27,428.40 = 15,661.20 : x
  2. Step 2: Convert to fraction form
    18,285.60/27,428.40 = 15,661.20/x
  3. Step 3: Cross multiply
    18,285.60x = 27,428.40 × 15,661.20
  4. Step 4: Simplify right side
    18,285.60x = 429,561,658.08
  5. Step 5: Solve for x
    x = 429,561,658.08/18,285.60
  6. Step 6: Final answer
    x = 23,491.80

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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.