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Finding the Fourth Proportional to 100,960.55, 139,326.47 and 55,640.15

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Solution

The fourth proportional to 100,960.55, 139,326.47 and 55,640.15 is: 76,783.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,960.55 : 139,326.47 = 55,640.15 : x
  2. Step 2: Convert to fraction form
    100,960.55/139,326.47 = 55,640.15/x
  3. Step 3: Cross multiply
    100,960.55x = 139,326.47 × 55,640.15
  4. Step 4: Simplify right side
    100,960.55x = 7,752,144,714.94
  5. Step 5: Solve for x
    x = 7,752,144,714.94/100,960.55
  6. Step 6: Final answer
    x = 76,783.90

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1.5x scale

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.