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Finding the Fourth Proportional to 58,781.75, 81,131.72 and 38,640.48

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Solution

The fourth proportional to 58,781.75, 81,131.72 and 38,640.48 is: 53,332.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,781.75 : 81,131.72 = 38,640.48 : x
  2. Step 2: Convert to fraction form
    58,781.75/81,131.72 = 38,640.48/x
  3. Step 3: Cross multiply
    58,781.75x = 81,131.72 × 38,640.48
  4. Step 4: Simplify right side
    58,781.75x = 3,134,968,410.82
  5. Step 5: Solve for x
    x = 3,134,968,410.82/58,781.75
  6. Step 6: Final answer
    x = 53,332.35

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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.