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Finding the Fourth Proportional to 100,805.39, 139,111.43 and 54,865.36

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Solution

The fourth proportional to 100,805.39, 139,111.43 and 54,865.36 is: 75,714.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,805.39 : 139,111.43 = 54,865.36 : x
  2. Step 2: Convert to fraction form
    100,805.39/139,111.43 = 54,865.36/x
  3. Step 3: Cross multiply
    100,805.39x = 139,111.43 × 54,865.36
  4. Step 4: Simplify right side
    100,805.39x = 7,632,398,306.63
  5. Step 5: Solve for x
    x = 7,632,398,306.63/100,805.39
  6. Step 6: Final answer
    x = 75,714.19

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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.