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Finding the Fourth Proportional to 100,960.74, 139,319.37 and 55,630.98

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Solution

The fourth proportional to 100,960.74, 139,319.37 and 55,630.98 is: 76,767.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,960.74 : 139,319.37 = 55,630.98 : x
  2. Step 2: Convert to fraction form
    100,960.74/139,319.37 = 55,630.98/x
  3. Step 3: Cross multiply
    100,960.74x = 139,319.37 × 55,630.98
  4. Step 4: Simplify right side
    100,960.74x = 7,750,473,086.08
  5. Step 5: Solve for x
    x = 7,750,473,086.08/100,960.74
  6. Step 6: Final answer
    x = 76,767.20

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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.