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Finding the Fourth Proportional to 170,429.40, 255,720.90 and 81,648.60

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Solution

The fourth proportional to 170,429.40, 255,720.90 and 81,648.60 is: 122,509.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,429.40 : 255,720.90 = 81,648.60 : x
  2. Step 2: Convert to fraction form
    170,429.40/255,720.90 = 81,648.60/x
  3. Step 3: Cross multiply
    170,429.40x = 255,720.90 × 81,648.60
  4. Step 4: Simplify right side
    170,429.40x = 20,879,253,475.74
  5. Step 5: Solve for x
    x = 20,879,253,475.74/170,429.40
  6. Step 6: Final answer
    x = 122,509.69

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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.