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Finding the Fourth Proportional to 770.35, 1,155.59 and 222.55

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Solution

The fourth proportional to 770.35, 1,155.59 and 222.55 is: 333.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.35 : 1,155.59 = 222.55 : x
  2. Step 2: Convert to fraction form
    770.35/1,155.59 = 222.55/x
  3. Step 3: Cross multiply
    770.35x = 1,155.59 × 222.55
  4. Step 4: Simplify right side
    770.35x = 257,176.55
  5. Step 5: Solve for x
    x = 257,176.55/770.35
  6. Step 6: Final answer
    x = 333.84

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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.