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Finding the Fourth Proportional to 398,809.95, 550,364.28 and 217,521.87

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Solution

The fourth proportional to 398,809.95, 550,364.28 and 217,521.87 is: 300,183.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,809.95 : 550,364.28 = 217,521.87 : x
  2. Step 2: Convert to fraction form
    398,809.95/550,364.28 = 217,521.87/x
  3. Step 3: Cross multiply
    398,809.95x = 550,364.28 × 217,521.87
  4. Step 4: Simplify right side
    398,809.95x = 119,716,267,366.80
  5. Step 5: Solve for x
    x = 119,716,267,366.80/398,809.95
  6. Step 6: Final answer
    x = 300,183.75

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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.