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Finding the Fourth Proportional to 387,978.88, 581,992.92 and 121,749.90

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Solution

The fourth proportional to 387,978.88, 581,992.92 and 121,749.90 is: 182,632.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,978.88 : 581,992.92 = 121,749.90 : x
  2. Step 2: Convert to fraction form
    387,978.88/581,992.92 = 121,749.90/x
  3. Step 3: Cross multiply
    387,978.88x = 581,992.92 × 121,749.90
  4. Step 4: Simplify right side
    387,978.88x = 70,857,579,810.71
  5. Step 5: Solve for x
    x = 70,857,579,810.71/387,978.88
  6. Step 6: Final answer
    x = 182,632.57

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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.