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Finding the Fourth Proportional to 489,781.20, 734,671.80 and 418,922.40

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Solution

The fourth proportional to 489,781.20, 734,671.80 and 418,922.40 is: 628,383.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,781.20 : 734,671.80 = 418,922.40 : x
  2. Step 2: Convert to fraction form
    489,781.20/734,671.80 = 418,922.40/x
  3. Step 3: Cross multiply
    489,781.20x = 734,671.80 × 418,922.40
  4. Step 4: Simplify right side
    489,781.20x = 307,770,473,668.32
  5. Step 5: Solve for x
    x = 307,770,473,668.32/489,781.20
  6. Step 6: Final answer
    x = 628,383.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.