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Finding the Fourth Proportional to 100,725.79, 139,004.21 and 55,404.94

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Solution

The fourth proportional to 100,725.79, 139,004.21 and 55,404.94 is: 76,460.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,725.79 : 139,004.21 = 55,404.94 : x
  2. Step 2: Convert to fraction form
    100,725.79/139,004.21 = 55,404.94/x
  3. Step 3: Cross multiply
    100,725.79x = 139,004.21 × 55,404.94
  4. Step 4: Simplify right side
    100,725.79x = 7,701,518,942.75
  5. Step 5: Solve for x
    x = 7,701,518,942.75/100,725.79
  6. Step 6: Final answer
    x = 76,460.25

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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.