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Finding the Fourth Proportional to 101,721, 140,383.62 and 57,017.64

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Solution

The fourth proportional to 101,721, 140,383.62 and 57,017.64 is: 78,689.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,721 : 140,383.62 = 57,017.64 : x
  2. Step 2: Convert to fraction form
    101,721/140,383.62 = 57,017.64/x
  3. Step 3: Cross multiply
    101,721x = 140,383.62 × 57,017.64
  4. Step 4: Simplify right side
    101,721x = 8,004,342,707.06
  5. Step 5: Solve for x
    x = 8,004,342,707.06/101,721
  6. Step 6: Final answer
    x = 78,689.19

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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.