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Finding the Fourth Proportional to 2,646.84, 3,970.68 and 699.21

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Solution

The fourth proportional to 2,646.84, 3,970.68 and 699.21 is: 1,048.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,646.84 : 3,970.68 = 699.21 : x
  2. Step 2: Convert to fraction form
    2,646.84/3,970.68 = 699.21/x
  3. Step 3: Cross multiply
    2,646.84x = 3,970.68 × 699.21
  4. Step 4: Simplify right side
    2,646.84x = 2,776,339.16
  5. Step 5: Solve for x
    x = 2,776,339.16/2,646.84
  6. Step 6: Final answer
    x = 1,048.93

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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.