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Finding the Fourth Proportional to 770.55, 1,155.70 and 250.59

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Solution

The fourth proportional to 770.55, 1,155.70 and 250.59 is: 375.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.55 : 1,155.70 = 250.59 : x
  2. Step 2: Convert to fraction form
    770.55/1,155.70 = 250.59/x
  3. Step 3: Cross multiply
    770.55x = 1,155.70 × 250.59
  4. Step 4: Simplify right side
    770.55x = 289,606.86
  5. Step 5: Solve for x
    x = 289,606.86/770.55
  6. Step 6: Final answer
    x = 375.85

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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.