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Finding the Fourth Proportional to 741.26, 1,107.20 and 619.68

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Solution

The fourth proportional to 741.26, 1,107.20 and 619.68 is: 925.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.26 : 1,107.20 = 619.68 : x
  2. Step 2: Convert to fraction form
    741.26/1,107.20 = 619.68/x
  3. Step 3: Cross multiply
    741.26x = 1,107.20 × 619.68
  4. Step 4: Simplify right side
    741.26x = 686,109.70
  5. Step 5: Solve for x
    x = 686,109.70/741.26
  6. Step 6: Final answer
    x = 925.60

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1.5x scale

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.