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Finding the Fourth Proportional to 784.68, 1,176.16 and 393.91

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Solution

The fourth proportional to 784.68, 1,176.16 and 393.91 is: 590.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.68 : 1,176.16 = 393.91 : x
  2. Step 2: Convert to fraction form
    784.68/1,176.16 = 393.91/x
  3. Step 3: Cross multiply
    784.68x = 1,176.16 × 393.91
  4. Step 4: Simplify right side
    784.68x = 463,295.30
  5. Step 5: Solve for x
    x = 463,295.30/784.68
  6. Step 6: Final answer
    x = 590.43

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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.