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Finding the Fourth Proportional to 70,221.36, 96,905.81 and 38,390.25

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Solution

The fourth proportional to 70,221.36, 96,905.81 and 38,390.25 is: 52,978.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,221.36 : 96,905.81 = 38,390.25 : x
  2. Step 2: Convert to fraction form
    70,221.36/96,905.81 = 38,390.25/x
  3. Step 3: Cross multiply
    70,221.36x = 96,905.81 × 38,390.25
  4. Step 4: Simplify right side
    70,221.36x = 3,720,238,272.35
  5. Step 5: Solve for x
    x = 3,720,238,272.35/70,221.36
  6. Step 6: Final answer
    x = 52,978.73

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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.