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Finding the Fourth Proportional to 670,365.88, 925,403.12 and 398,521.78

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Solution

The fourth proportional to 670,365.88, 925,403.12 and 398,521.78 is: 550,137.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    670,365.88 : 925,403.12 = 398,521.78 : x
  2. Step 2: Convert to fraction form
    670,365.88/925,403.12 = 398,521.78/x
  3. Step 3: Cross multiply
    670,365.88x = 925,403.12 × 398,521.78
  4. Step 4: Simplify right side
    670,365.88x = 368,793,298,599.95
  5. Step 5: Solve for x
    x = 368,793,298,599.95/670,365.88
  6. Step 6: Final answer
    x = 550,137.33

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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.