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Finding the Fourth Proportional to 387,109.94, 534,193.66 and 215,039.05

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Solution

The fourth proportional to 387,109.94, 534,193.66 and 215,039.05 is: 296,743.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,109.94 : 534,193.66 = 215,039.05 : x
  2. Step 2: Convert to fraction form
    387,109.94/534,193.66 = 215,039.05/x
  3. Step 3: Cross multiply
    387,109.94x = 534,193.66 × 215,039.05
  4. Step 4: Simplify right side
    387,109.94x = 114,872,498,495.78
  5. Step 5: Solve for x
    x = 114,872,498,495.78/387,109.94
  6. Step 6: Final answer
    x = 296,743.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.