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Finding the Fourth Proportional to 100,808.79, 139,115.04 and 55,485.80

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Solution

The fourth proportional to 100,808.79, 139,115.04 and 55,485.80 is: 76,569.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,808.79 : 139,115.04 = 55,485.80 : x
  2. Step 2: Convert to fraction form
    100,808.79/139,115.04 = 55,485.80/x
  3. Step 3: Cross multiply
    100,808.79x = 139,115.04 × 55,485.80
  4. Step 4: Simplify right side
    100,808.79x = 7,718,908,590.86
  5. Step 5: Solve for x
    x = 7,718,908,590.86/100,808.79
  6. Step 6: Final answer
    x = 76,569.80

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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.