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Finding the Fourth Proportional to 770.94, 1,154.70 and 640.67

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Solution

The fourth proportional to 770.94, 1,154.70 and 640.67 is: 959.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.94 : 1,154.70 = 640.67 : x
  2. Step 2: Convert to fraction form
    770.94/1,154.70 = 640.67/x
  3. Step 3: Cross multiply
    770.94x = 1,154.70 × 640.67
  4. Step 4: Simplify right side
    770.94x = 739,775.88
  5. Step 5: Solve for x
    x = 739,775.88/770.94
  6. Step 6: Final answer
    x = 959.58

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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.