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Finding the Fourth Proportional to 772.70, 1,158.34 and 285.40

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Solution

The fourth proportional to 772.70, 1,158.34 and 285.40 is: 427.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.70 : 1,158.34 = 285.40 : x
  2. Step 2: Convert to fraction form
    772.70/1,158.34 = 285.40/x
  3. Step 3: Cross multiply
    772.70x = 1,158.34 × 285.40
  4. Step 4: Simplify right side
    772.70x = 330,590.24
  5. Step 5: Solve for x
    x = 330,590.24/772.70
  6. Step 6: Final answer
    x = 427.84

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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.