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Finding the Fourth Proportional to 785.21, 1,178.01 and 394.25

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Solution

The fourth proportional to 785.21, 1,178.01 and 394.25 is: 591.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.21 : 1,178.01 = 394.25 : x
  2. Step 2: Convert to fraction form
    785.21/1,178.01 = 394.25/x
  3. Step 3: Cross multiply
    785.21x = 1,178.01 × 394.25
  4. Step 4: Simplify right side
    785.21x = 464,424.55
  5. Step 5: Solve for x
    x = 464,424.55/785.21
  6. Step 6: Final answer
    x = 591.46

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1.5x scale

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.