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Finding the Fourth Proportional to 1,307.84, 1,961.34 and 691.19

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Solution

The fourth proportional to 1,307.84, 1,961.34 and 691.19 is: 1,036.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.84 : 1,961.34 = 691.19 : x
  2. Step 2: Convert to fraction form
    1,307.84/1,961.34 = 691.19/x
  3. Step 3: Cross multiply
    1,307.84x = 1,961.34 × 691.19
  4. Step 4: Simplify right side
    1,307.84x = 1,355,658.59
  5. Step 5: Solve for x
    x = 1,355,658.59/1,307.84
  6. Step 6: Final answer
    x = 1,036.56

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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.