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Finding the Fourth Proportional to 100,847.81, 139,208.05 and 79,281.29

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Solution

The fourth proportional to 100,847.81, 139,208.05 and 79,281.29 is: 109,438.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,847.81 : 139,208.05 = 79,281.29 : x
  2. Step 2: Convert to fraction form
    100,847.81/139,208.05 = 79,281.29/x
  3. Step 3: Cross multiply
    100,847.81x = 139,208.05 × 79,281.29
  4. Step 4: Simplify right side
    100,847.81x = 11,036,594,229.51
  5. Step 5: Solve for x
    x = 11,036,594,229.51/100,847.81
  6. Step 6: Final answer
    x = 109,438.11

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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.