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Finding the Fourth Proportional to 387,672.92, 581,509.40 and 121,434.39

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Solution

The fourth proportional to 387,672.92, 581,509.40 and 121,434.39 is: 182,151.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,672.92 : 581,509.40 = 121,434.39 : x
  2. Step 2: Convert to fraction form
    387,672.92/581,509.40 = 121,434.39/x
  3. Step 3: Cross multiply
    387,672.92x = 581,509.40 × 121,434.39
  4. Step 4: Simplify right side
    387,672.92x = 70,615,238,661.09
  5. Step 5: Solve for x
    x = 70,615,238,661.09/387,672.92
  6. Step 6: Final answer
    x = 182,151.59

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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.