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Finding the Fourth Proportional to 431,689.80, 647,534.70 and 398,512.20

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Solution

The fourth proportional to 431,689.80, 647,534.70 and 398,512.20 is: 597,768.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,689.80 : 647,534.70 = 398,512.20 : x
  2. Step 2: Convert to fraction form
    431,689.80/647,534.70 = 398,512.20/x
  3. Step 3: Cross multiply
    431,689.80x = 647,534.70 × 398,512.20
  4. Step 4: Simplify right side
    431,689.80x = 258,050,477,873.34
  5. Step 5: Solve for x
    x = 258,050,477,873.34/431,689.80
  6. Step 6: Final answer
    x = 597,768.30

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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.