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Finding the Fourth Proportional to 2,646.86, 3,970.31 and 698.81

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Solution

The fourth proportional to 2,646.86, 3,970.31 and 698.81 is: 1,048.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,646.86 : 3,970.31 = 698.81 : x
  2. Step 2: Convert to fraction form
    2,646.86/3,970.31 = 698.81/x
  3. Step 3: Cross multiply
    2,646.86x = 3,970.31 × 698.81
  4. Step 4: Simplify right side
    2,646.86x = 2,774,468.99
  5. Step 5: Solve for x
    x = 2,774,468.99/2,646.86
  6. Step 6: Final answer
    x = 1,048.21

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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.