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Finding the Fourth Proportional to 431,703.40, 647,555.10 and 136,215.40

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Solution

The fourth proportional to 431,703.40, 647,555.10 and 136,215.40 is: 204,323.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,703.40 : 647,555.10 = 136,215.40 : x
  2. Step 2: Convert to fraction form
    431,703.40/647,555.10 = 136,215.40/x
  3. Step 3: Cross multiply
    431,703.40x = 647,555.10 × 136,215.40
  4. Step 4: Simplify right side
    431,703.40x = 88,206,976,968.54
  5. Step 5: Solve for x
    x = 88,206,976,968.54/431,703.40
  6. Step 6: Final answer
    x = 204,323.10

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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.