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Finding the Fourth Proportional to 770.42, 1,156.98 and 756.92

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Solution

The fourth proportional to 770.42, 1,156.98 and 756.92 is: 1,136.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.42 : 1,156.98 = 756.92 : x
  2. Step 2: Convert to fraction form
    770.42/1,156.98 = 756.92/x
  3. Step 3: Cross multiply
    770.42x = 1,156.98 × 756.92
  4. Step 4: Simplify right side
    770.42x = 875,741.30
  5. Step 5: Solve for x
    x = 875,741.30/770.42
  6. Step 6: Final answer
    x = 1,136.71

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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.