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Finding the Fourth Proportional to 387,855.81, 581,783.85 and 121,639.59

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Solution

The fourth proportional to 387,855.81, 581,783.85 and 121,639.59 is: 182,459.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,855.81 : 581,783.85 = 121,639.59 : x
  2. Step 2: Convert to fraction form
    387,855.81/581,783.85 = 121,639.59/x
  3. Step 3: Cross multiply
    387,855.81x = 581,783.85 × 121,639.59
  4. Step 4: Simplify right side
    387,855.81x = 70,767,948,982.62
  5. Step 5: Solve for x
    x = 70,767,948,982.62/387,855.81
  6. Step 6: Final answer
    x = 182,459.43

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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.