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Finding the Fourth Proportional to 1,699.91, 2,345.24 and 991.64

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Solution

The fourth proportional to 1,699.91, 2,345.24 and 991.64 is: 1,368.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,699.91 : 2,345.24 = 991.64 : x
  2. Step 2: Convert to fraction form
    1,699.91/2,345.24 = 991.64/x
  3. Step 3: Cross multiply
    1,699.91x = 2,345.24 × 991.64
  4. Step 4: Simplify right side
    1,699.91x = 2,325,617.11
  5. Step 5: Solve for x
    x = 2,325,617.11/1,699.91
  6. Step 6: Final answer
    x = 1,368.09

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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.