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Finding the Fourth Proportional to 83,421.90, 115,092.90 and 57,921.48

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Solution

The fourth proportional to 83,421.90, 115,092.90 and 57,921.48 is: 79,911.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,421.90 : 115,092.90 = 57,921.48 : x
  2. Step 2: Convert to fraction form
    83,421.90/115,092.90 = 57,921.48/x
  3. Step 3: Cross multiply
    83,421.90x = 115,092.90 × 57,921.48
  4. Step 4: Simplify right side
    83,421.90x = 6,666,351,105.49
  5. Step 5: Solve for x
    x = 6,666,351,105.49/83,421.90
  6. Step 6: Final answer
    x = 79,911.28

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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.