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Finding the Fourth Proportional to 777.66, 1,073.21 and 428.34

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Solution

The fourth proportional to 777.66, 1,073.21 and 428.34 is: 591.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.66 : 1,073.21 = 428.34 : x
  2. Step 2: Convert to fraction form
    777.66/1,073.21 = 428.34/x
  3. Step 3: Cross multiply
    777.66x = 1,073.21 × 428.34
  4. Step 4: Simplify right side
    777.66x = 459,698.77
  5. Step 5: Solve for x
    x = 459,698.77/777.66
  6. Step 6: Final answer
    x = 591.13

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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.