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Finding the Fourth Proportional to 772.23, 1,158.70 and 285.18

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Solution

The fourth proportional to 772.23, 1,158.70 and 285.18 is: 427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.23 : 1,158.70 = 285.18 : x
  2. Step 2: Convert to fraction form
    772.23/1,158.70 = 285.18/x
  3. Step 3: Cross multiply
    772.23x = 1,158.70 × 285.18
  4. Step 4: Simplify right side
    772.23x = 330,438.07
  5. Step 5: Solve for x
    x = 330,438.07/772.23
  6. Step 6: Final answer
    x = 427.90

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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.