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Finding the Fourth Proportional to 784.45, 1,176.74 and 394.25

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Solution

The fourth proportional to 784.45, 1,176.74 and 394.25 is: 591.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.45 : 1,176.74 = 394.25 : x
  2. Step 2: Convert to fraction form
    784.45/1,176.74 = 394.25/x
  3. Step 3: Cross multiply
    784.45x = 1,176.74 × 394.25
  4. Step 4: Simplify right side
    784.45x = 463,927.78
  5. Step 5: Solve for x
    x = 463,927.78/784.45
  6. Step 6: Final answer
    x = 591.40

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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.