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Finding the Fourth Proportional to 780.68, 1,164.05 and 694.82

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Solution

The fourth proportional to 780.68, 1,164.05 and 694.82 is: 1,036.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.68 : 1,164.05 = 694.82 : x
  2. Step 2: Convert to fraction form
    780.68/1,164.05 = 694.82/x
  3. Step 3: Cross multiply
    780.68x = 1,164.05 × 694.82
  4. Step 4: Simplify right side
    780.68x = 808,805.22
  5. Step 5: Solve for x
    x = 808,805.22/780.68
  6. Step 6: Final answer
    x = 1,036.03

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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.