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Finding the Fourth Proportional to 784.21, 1,176.34 and 297.29

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Solution

The fourth proportional to 784.21, 1,176.34 and 297.29 is: 445.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.21 : 1,176.34 = 297.29 : x
  2. Step 2: Convert to fraction form
    784.21/1,176.34 = 297.29/x
  3. Step 3: Cross multiply
    784.21x = 1,176.34 × 297.29
  4. Step 4: Simplify right side
    784.21x = 349,716.32
  5. Step 5: Solve for x
    x = 349,716.32/784.21
  6. Step 6: Final answer
    x = 445.95

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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.