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Finding the Fourth Proportional to 70,138, 96,790.44 and 40,330

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Solution

The fourth proportional to 70,138, 96,790.44 and 40,330 is: 55,655.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,138 : 96,790.44 = 40,330 : x
  2. Step 2: Convert to fraction form
    70,138/96,790.44 = 40,330/x
  3. Step 3: Cross multiply
    70,138x = 96,790.44 × 40,330
  4. Step 4: Simplify right side
    70,138x = 3,903,558,445.20
  5. Step 5: Solve for x
    x = 3,903,558,445.20/70,138
  6. Step 6: Final answer
    x = 55,655.40

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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.