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Finding the Fourth Proportional to 18,728.84, 25,839.60 and 12,358.60

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Solution

The fourth proportional to 18,728.84, 25,839.60 and 12,358.60 is: 17,050.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,728.84 : 25,839.60 = 12,358.60 : x
  2. Step 2: Convert to fraction form
    18,728.84/25,839.60 = 12,358.60/x
  3. Step 3: Cross multiply
    18,728.84x = 25,839.60 × 12,358.60
  4. Step 4: Simplify right side
    18,728.84x = 319,341,151.36
  5. Step 5: Solve for x
    x = 319,341,151.36/18,728.84
  6. Step 6: Final answer
    x = 17,050.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.