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Finding the Fourth Proportional to 806,728.20, 1,208,342.70 and 666,760.20

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Solution

The fourth proportional to 806,728.20, 1,208,342.70 and 666,760.20 is: 998,694.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    806,728.20 : 1,208,342.70 = 666,760.20 : x
  2. Step 2: Convert to fraction form
    806,728.20/1,208,342.70 = 666,760.20/x
  3. Step 3: Cross multiply
    806,728.20x = 1,208,342.70 × 666,760.20
  4. Step 4: Simplify right side
    806,728.20x = 805,674,820,320.54
  5. Step 5: Solve for x
    x = 805,674,820,320.54/806,728.20
  6. Step 6: Final answer
    x = 998,694.26

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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.