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Finding the Fourth Proportional to 387,978.10, 581,991.75 and 121,749.12

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Solution

The fourth proportional to 387,978.10, 581,991.75 and 121,749.12 is: 182,631.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,978.10 : 581,991.75 = 121,749.12 : x
  2. Step 2: Convert to fraction form
    387,978.10/581,991.75 = 121,749.12/x
  3. Step 3: Cross multiply
    387,978.10x = 581,991.75 × 121,749.12
  4. Step 4: Simplify right side
    387,978.10x = 70,856,982,953.20
  5. Step 5: Solve for x
    x = 70,856,982,953.20/387,978.10
  6. Step 6: Final answer
    x = 182,631.40

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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.