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Finding the Fourth Proportional to 777.69, 1,071.45 and 637.83

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Solution

The fourth proportional to 777.69, 1,071.45 and 637.83 is: 878.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.69 : 1,071.45 = 637.83 : x
  2. Step 2: Convert to fraction form
    777.69/1,071.45 = 637.83/x
  3. Step 3: Cross multiply
    777.69x = 1,071.45 × 637.83
  4. Step 4: Simplify right side
    777.69x = 683,402.95
  5. Step 5: Solve for x
    x = 683,402.95/777.69
  6. Step 6: Final answer
    x = 878.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.