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Finding the Fourth Proportional to 776.21, 1,071.17 and 426.90

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Solution

The fourth proportional to 776.21, 1,071.17 and 426.90 is: 589.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.21 : 1,071.17 = 426.90 : x
  2. Step 2: Convert to fraction form
    776.21/1,071.17 = 426.90/x
  3. Step 3: Cross multiply
    776.21x = 1,071.17 × 426.90
  4. Step 4: Simplify right side
    776.21x = 457,280.34
  5. Step 5: Solve for x
    x = 457,280.34/776.21
  6. Step 6: Final answer
    x = 589.12

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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.