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Finding the Fourth Proportional to 819,908.80, 1,230,170.40 and 321,630.40

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Solution

The fourth proportional to 819,908.80, 1,230,170.40 and 321,630.40 is: 482,566.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,908.80 : 1,230,170.40 = 321,630.40 : x
  2. Step 2: Convert to fraction form
    819,908.80/1,230,170.40 = 321,630.40/x
  3. Step 3: Cross multiply
    819,908.80x = 1,230,170.40 × 321,630.40
  4. Step 4: Simplify right side
    819,908.80x = 395,660,197,820.16
  5. Step 5: Solve for x
    x = 395,660,197,820.16/819,908.80
  6. Step 6: Final answer
    x = 482,566.11

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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.