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Finding the Fourth Proportional to 776.30, 1,071.29 and 426.99

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Solution

The fourth proportional to 776.30, 1,071.29 and 426.99 is: 589.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.30 : 1,071.29 = 426.99 : x
  2. Step 2: Convert to fraction form
    776.30/1,071.29 = 426.99/x
  3. Step 3: Cross multiply
    776.30x = 1,071.29 × 426.99
  4. Step 4: Simplify right side
    776.30x = 457,431.18
  5. Step 5: Solve for x
    x = 457,431.18/776.30
  6. Step 6: Final answer
    x = 589.24

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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.