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Finding the Fourth Proportional to 100,785.44, 139,055.05 and 64,996

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Solution

The fourth proportional to 100,785.44, 139,055.05 and 64,996 is: 89,675.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,785.44 : 139,055.05 = 64,996 : x
  2. Step 2: Convert to fraction form
    100,785.44/139,055.05 = 64,996/x
  3. Step 3: Cross multiply
    100,785.44x = 139,055.05 × 64,996
  4. Step 4: Simplify right side
    100,785.44x = 9,038,022,029.80
  5. Step 5: Solve for x
    x = 9,038,022,029.80/100,785.44
  6. Step 6: Final answer
    x = 89,675.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.