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Finding the Fourth Proportional to 354,589.40, 489,396.84 and 211,358.72

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Solution

The fourth proportional to 354,589.40, 489,396.84 and 211,358.72 is: 291,712.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,589.40 : 489,396.84 = 211,358.72 : x
  2. Step 2: Convert to fraction form
    354,589.40/489,396.84 = 211,358.72/x
  3. Step 3: Cross multiply
    354,589.40x = 489,396.84 × 211,358.72
  4. Step 4: Simplify right side
    354,589.40x = 103,438,289,674.45
  5. Step 5: Solve for x
    x = 103,438,289,674.45/354,589.40
  6. Step 6: Final answer
    x = 291,712.86

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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.