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Finding the Fourth Proportional to 1,788.66, 2,468.31 and 991.98

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Solution

The fourth proportional to 1,788.66, 2,468.31 and 991.98 is: 1,368.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,788.66 : 2,468.31 = 991.98 : x
  2. Step 2: Convert to fraction form
    1,788.66/2,468.31 = 991.98/x
  3. Step 3: Cross multiply
    1,788.66x = 2,468.31 × 991.98
  4. Step 4: Simplify right side
    1,788.66x = 2,448,501.81
  5. Step 5: Solve for x
    x = 2,448,501.81/1,788.66
  6. Step 6: Final answer
    x = 1,368.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.