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Finding the Fourth Proportional to 15,540.10, 21,785.30 and 15,540.10

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Solution

The fourth proportional to 15,540.10, 21,785.30 and 15,540.10 is: 21,785.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,540.10 : 21,785.30 = 15,540.10 : x
  2. Step 2: Convert to fraction form
    15,540.10/21,785.30 = 15,540.10/x
  3. Step 3: Cross multiply
    15,540.10x = 21,785.30 × 15,540.10
  4. Step 4: Simplify right side
    15,540.10x = 338,545,740.53
  5. Step 5: Solve for x
    x = 338,545,740.53/15,540.10
  6. Step 6: Final answer
    x = 21,785.30

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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.