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Finding the Fourth Proportional to 85,460.20, 128,103.90 and 38,746.60

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Solution

The fourth proportional to 85,460.20, 128,103.90 and 38,746.60 is: 58,080.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,460.20 : 128,103.90 = 38,746.60 : x
  2. Step 2: Convert to fraction form
    85,460.20/128,103.90 = 38,746.60/x
  3. Step 3: Cross multiply
    85,460.20x = 128,103.90 × 38,746.60
  4. Step 4: Simplify right side
    85,460.20x = 4,963,590,571.74
  5. Step 5: Solve for x
    x = 4,963,590,571.74/85,460.20
  6. Step 6: Final answer
    x = 58,080.73

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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.