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Finding the Fourth Proportional to 670,364.88, 925,401.74 and 398,520.78

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Solution

The fourth proportional to 670,364.88, 925,401.74 and 398,520.78 is: 550,135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    670,364.88 : 925,401.74 = 398,520.78 : x
  2. Step 2: Convert to fraction form
    670,364.88/925,401.74 = 398,520.78/x
  3. Step 3: Cross multiply
    670,364.88x = 925,401.74 × 398,520.78
  4. Step 4: Simplify right side
    670,364.88x = 368,791,823,238.16
  5. Step 5: Solve for x
    x = 368,791,823,238.16/670,364.88
  6. Step 6: Final answer
    x = 550,135.95

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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.