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Finding the Fourth Proportional to 784.89, 1,176.89 and 322.99

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Solution

The fourth proportional to 784.89, 1,176.89 and 322.99 is: 484.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.89 : 1,176.89 = 322.99 : x
  2. Step 2: Convert to fraction form
    784.89/1,176.89 = 322.99/x
  3. Step 3: Cross multiply
    784.89x = 1,176.89 × 322.99
  4. Step 4: Simplify right side
    784.89x = 380,120.05
  5. Step 5: Solve for x
    x = 380,120.05/784.89
  6. Step 6: Final answer
    x = 484.30

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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.