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Finding the Fourth Proportional to 25,785.60, 38,721.60 and 17,059.20

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Solution

The fourth proportional to 25,785.60, 38,721.60 and 17,059.20 is: 25,617.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,785.60 : 38,721.60 = 17,059.20 : x
  2. Step 2: Convert to fraction form
    25,785.60/38,721.60 = 17,059.20/x
  3. Step 3: Cross multiply
    25,785.60x = 38,721.60 × 17,059.20
  4. Step 4: Simplify right side
    25,785.60x = 660,559,518.72
  5. Step 5: Solve for x
    x = 660,559,518.72/25,785.60
  6. Step 6: Final answer
    x = 25,617.38

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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.