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Finding the Fourth Proportional to 387,805.48, 581,708.39 and 121,586.74

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Solution

The fourth proportional to 387,805.48, 581,708.39 and 121,586.74 is: 182,380.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,805.48 : 581,708.39 = 121,586.74 : x
  2. Step 2: Convert to fraction form
    387,805.48/581,708.39 = 121,586.74/x
  3. Step 3: Cross multiply
    387,805.48x = 581,708.39 × 121,586.74
  4. Step 4: Simplify right side
    387,805.48x = 70,728,026,770.75
  5. Step 5: Solve for x
    x = 70,728,026,770.75/387,805.48
  6. Step 6: Final answer
    x = 182,380.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.