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Finding the Fourth Proportional to 18,521.40, 25,981.80 and 18,521.40

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Solution

The fourth proportional to 18,521.40, 25,981.80 and 18,521.40 is: 25,981.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,521.40 : 25,981.80 = 18,521.40 : x
  2. Step 2: Convert to fraction form
    18,521.40/25,981.80 = 18,521.40/x
  3. Step 3: Cross multiply
    18,521.40x = 25,981.80 × 18,521.40
  4. Step 4: Simplify right side
    18,521.40x = 481,219,310.52
  5. Step 5: Solve for x
    x = 481,219,310.52/18,521.40
  6. Step 6: Final answer
    x = 25,981.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.