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Finding the Fourth Proportional to 394,127, 543,895.32 and 215,279

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Solution

The fourth proportional to 394,127, 543,895.32 and 215,279 is: 297,085.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,127 : 543,895.32 = 215,279 : x
  2. Step 2: Convert to fraction form
    394,127/543,895.32 = 215,279/x
  3. Step 3: Cross multiply
    394,127x = 543,895.32 × 215,279
  4. Step 4: Simplify right side
    394,127x = 117,089,240,594.28
  5. Step 5: Solve for x
    x = 117,089,240,594.28/394,127
  6. Step 6: Final answer
    x = 297,085.05

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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.