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Finding the Fourth Proportional to 796.35, 1,189.40 and 687.00

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Solution

The fourth proportional to 796.35, 1,189.40 and 687.00 is: 1,026.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    796.35 : 1,189.40 = 687.00 : x
  2. Step 2: Convert to fraction form
    796.35/1,189.40 = 687.00/x
  3. Step 3: Cross multiply
    796.35x = 1,189.40 × 687.00
  4. Step 4: Simplify right side
    796.35x = 817,118.83
  5. Step 5: Solve for x
    x = 817,118.83/796.35
  6. Step 6: Final answer
    x = 1,026.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.