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Finding the Fourth Proportional to 777.47, 1,071.66 and 611.46

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Solution

The fourth proportional to 777.47, 1,071.66 and 611.46 is: 842.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.47 : 1,071.66 = 611.46 : x
  2. Step 2: Convert to fraction form
    777.47/1,071.66 = 611.46/x
  3. Step 3: Cross multiply
    777.47x = 1,071.66 × 611.46
  4. Step 4: Simplify right side
    777.47x = 655,279.52
  5. Step 5: Solve for x
    x = 655,279.52/777.47
  6. Step 6: Final answer
    x = 842.84

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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.