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Finding the Fourth Proportional to 806.70, 1,210.65 and 650.88

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Solution

The fourth proportional to 806.70, 1,210.65 and 650.88 is: 976.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.70 : 1,210.65 = 650.88 : x
  2. Step 2: Convert to fraction form
    806.70/1,210.65 = 650.88/x
  3. Step 3: Cross multiply
    806.70x = 1,210.65 × 650.88
  4. Step 4: Simplify right side
    806.70x = 787,987.87
  5. Step 5: Solve for x
    x = 787,987.87/806.70
  6. Step 6: Final answer
    x = 976.80

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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.