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Finding the Fourth Proportional to 770.69, 1,059.45 and 663.95

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Solution

The fourth proportional to 770.69, 1,059.45 and 663.95 is: 912.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.69 : 1,059.45 = 663.95 : x
  2. Step 2: Convert to fraction form
    770.69/1,059.45 = 663.95/x
  3. Step 3: Cross multiply
    770.69x = 1,059.45 × 663.95
  4. Step 4: Simplify right side
    770.69x = 703,418.51
  5. Step 5: Solve for x
    x = 703,418.51/770.69
  6. Step 6: Final answer
    x = 912.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.