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Finding the Fourth Proportional to 690.80, 1,036.17 and 170.80

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Solution

The fourth proportional to 690.80, 1,036.17 and 170.80 is: 256.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.80 : 1,036.17 = 170.80 : x
  2. Step 2: Convert to fraction form
    690.80/1,036.17 = 170.80/x
  3. Step 3: Cross multiply
    690.80x = 1,036.17 × 170.80
  4. Step 4: Simplify right side
    690.80x = 176,977.84
  5. Step 5: Solve for x
    x = 176,977.84/690.80
  6. Step 6: Final answer
    x = 256.19

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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.