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Finding the Fourth Proportional to 100,768.86, 139,060.98 and 55,445.88

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Solution

The fourth proportional to 100,768.86, 139,060.98 and 55,445.88 is: 76,515.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,768.86 : 139,060.98 = 55,445.88 : x
  2. Step 2: Convert to fraction form
    100,768.86/139,060.98 = 55,445.88/x
  3. Step 3: Cross multiply
    100,768.86x = 139,060.98 × 55,445.88
  4. Step 4: Simplify right side
    100,768.86x = 7,710,358,409.76
  5. Step 5: Solve for x
    x = 7,710,358,409.76/100,768.86
  6. Step 6: Final answer
    x = 76,515.29

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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.