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Finding the Fourth Proportional to 18,520, 25,557.78 and 10,136.68

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Solution

The fourth proportional to 18,520, 25,557.78 and 10,136.68 is: 13,988.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,520 : 25,557.78 = 10,136.68 : x
  2. Step 2: Convert to fraction form
    18,520/25,557.78 = 10,136.68/x
  3. Step 3: Cross multiply
    18,520x = 25,557.78 × 10,136.68
  4. Step 4: Simplify right side
    18,520x = 259,071,037.37
  5. Step 5: Solve for x
    x = 259,071,037.37/18,520
  6. Step 6: Final answer
    x = 13,988.72

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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.