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Finding the Fourth Proportional to 759.34, 1,047.63 and 619.21

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Solution

The fourth proportional to 759.34, 1,047.63 and 619.21 is: 854.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.34 : 1,047.63 = 619.21 : x
  2. Step 2: Convert to fraction form
    759.34/1,047.63 = 619.21/x
  3. Step 3: Cross multiply
    759.34x = 1,047.63 × 619.21
  4. Step 4: Simplify right side
    759.34x = 648,709.55
  5. Step 5: Solve for x
    x = 648,709.55/759.34
  6. Step 6: Final answer
    x = 854.31

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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.