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Finding the Fourth Proportional to 100,800.78, 139,102.51 and 54,858.46

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Solution

The fourth proportional to 100,800.78, 139,102.51 and 54,858.46 is: 75,703.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,800.78 : 139,102.51 = 54,858.46 : x
  2. Step 2: Convert to fraction form
    100,800.78/139,102.51 = 54,858.46/x
  3. Step 3: Cross multiply
    100,800.78x = 139,102.51 × 54,858.46
  4. Step 4: Simplify right side
    100,800.78x = 7,630,949,480.73
  5. Step 5: Solve for x
    x = 7,630,949,480.73/100,800.78
  6. Step 6: Final answer
    x = 75,703.28

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1.5x scale

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.