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Finding the Fourth Proportional to 1,091.75, 1,506.65 and 619.65

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Solution

The fourth proportional to 1,091.75, 1,506.65 and 619.65 is: 855.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.75 : 1,506.65 = 619.65 : x
  2. Step 2: Convert to fraction form
    1,091.75/1,506.65 = 619.65/x
  3. Step 3: Cross multiply
    1,091.75x = 1,506.65 × 619.65
  4. Step 4: Simplify right side
    1,091.75x = 933,600.99
  5. Step 5: Solve for x
    x = 933,600.99/1,091.75
  6. Step 6: Final answer
    x = 855.14

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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.