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Finding the Fourth Proportional to 100,807.29, 139,112.97 and 55,484.30

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Solution

The fourth proportional to 100,807.29, 139,112.97 and 55,484.30 is: 76,567.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,807.29 : 139,112.97 = 55,484.30 : x
  2. Step 2: Convert to fraction form
    100,807.29/139,112.97 = 55,484.30/x
  3. Step 3: Cross multiply
    100,807.29x = 139,112.97 × 55,484.30
  4. Step 4: Simplify right side
    100,807.29x = 7,718,585,065.81
  5. Step 5: Solve for x
    x = 7,718,585,065.81/100,807.29
  6. Step 6: Final answer
    x = 76,567.73

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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.