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Finding the Fourth Proportional to 777.57, 1,071.92 and 611.50

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Solution

The fourth proportional to 777.57, 1,071.92 and 611.50 is: 842.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.57 : 1,071.92 = 611.50 : x
  2. Step 2: Convert to fraction form
    777.57/1,071.92 = 611.50/x
  3. Step 3: Cross multiply
    777.57x = 1,071.92 × 611.50
  4. Step 4: Simplify right side
    777.57x = 655,473.34
  5. Step 5: Solve for x
    x = 655,473.34/777.57
  6. Step 6: Final answer
    x = 842.98

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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.