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Finding the Fourth Proportional to 25,665.80, 38,425.80 and 19,785.20

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Solution

The fourth proportional to 25,665.80, 38,425.80 and 19,785.20 is: 29,621.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,665.80 : 38,425.80 = 19,785.20 : x
  2. Step 2: Convert to fraction form
    25,665.80/38,425.80 = 19,785.20/x
  3. Step 3: Cross multiply
    25,665.80x = 38,425.80 × 19,785.20
  4. Step 4: Simplify right side
    25,665.80x = 760,262,138.16
  5. Step 5: Solve for x
    x = 760,262,138.16/25,665.80
  6. Step 6: Final answer
    x = 29,621.60

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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.