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Finding the Fourth Proportional to 70,221.62, 96,905.84 and 38,390.51

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Solution

The fourth proportional to 70,221.62, 96,905.84 and 38,390.51 is: 52,978.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,221.62 : 96,905.84 = 38,390.51 : x
  2. Step 2: Convert to fraction form
    70,221.62/96,905.84 = 38,390.51/x
  3. Step 3: Cross multiply
    70,221.62x = 96,905.84 × 38,390.51
  4. Step 4: Simplify right side
    70,221.62x = 3,720,264,669.89
  5. Step 5: Solve for x
    x = 3,720,264,669.89/70,221.62
  6. Step 6: Final answer
    x = 52,978.91

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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.