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Finding the Fourth Proportional to 776.76, 1,071.93 and 422.68

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Solution

The fourth proportional to 776.76, 1,071.93 and 422.68 is: 583.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.76 : 1,071.93 = 422.68 : x
  2. Step 2: Convert to fraction form
    776.76/1,071.93 = 422.68/x
  3. Step 3: Cross multiply
    776.76x = 1,071.93 × 422.68
  4. Step 4: Simplify right side
    776.76x = 453,080.72
  5. Step 5: Solve for x
    x = 453,080.72/776.76
  6. Step 6: Final answer
    x = 583.30

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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.