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Finding the Fourth Proportional to 100,808.64, 139,114.82 and 55,485.65

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Solution

The fourth proportional to 100,808.64, 139,114.82 and 55,485.65 is: 76,569.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,808.64 : 139,114.82 = 55,485.65 : x
  2. Step 2: Convert to fraction form
    100,808.64/139,114.82 = 55,485.65/x
  3. Step 3: Cross multiply
    100,808.64x = 139,114.82 × 55,485.65
  4. Step 4: Simplify right side
    100,808.64x = 7,718,875,408.58
  5. Step 5: Solve for x
    x = 7,718,875,408.58/100,808.64
  6. Step 6: Final answer
    x = 76,569.58

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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.