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Finding the Fourth Proportional to 777.69, 1,073.12 and 428.31

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Solution

The fourth proportional to 777.69, 1,073.12 and 428.31 is: 591.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.69 : 1,073.12 = 428.31 : x
  2. Step 2: Convert to fraction form
    777.69/1,073.12 = 428.31/x
  3. Step 3: Cross multiply
    777.69x = 1,073.12 × 428.31
  4. Step 4: Simplify right side
    777.69x = 459,625.89
  5. Step 5: Solve for x
    x = 459,625.89/777.69
  6. Step 6: Final answer
    x = 591.01

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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.