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Finding the Fourth Proportional to 772.66, 1,158.46 and 285.45

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Solution

The fourth proportional to 772.66, 1,158.46 and 285.45 is: 427.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.66 : 1,158.46 = 285.45 : x
  2. Step 2: Convert to fraction form
    772.66/1,158.46 = 285.45/x
  3. Step 3: Cross multiply
    772.66x = 1,158.46 × 285.45
  4. Step 4: Simplify right side
    772.66x = 330,682.41
  5. Step 5: Solve for x
    x = 330,682.41/772.66
  6. Step 6: Final answer
    x = 427.98

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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.