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Finding the Fourth Proportional to 1,491.21, 2,235.30 and 613.35

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Solution

The fourth proportional to 1,491.21, 2,235.30 and 613.35 is: 919.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.21 : 2,235.30 = 613.35 : x
  2. Step 2: Convert to fraction form
    1,491.21/2,235.30 = 613.35/x
  3. Step 3: Cross multiply
    1,491.21x = 2,235.30 × 613.35
  4. Step 4: Simplify right side
    1,491.21x = 1,371,021.26
  5. Step 5: Solve for x
    x = 1,371,021.26/1,491.21
  6. Step 6: Final answer
    x = 919.40

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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.