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Finding the Fourth Proportional to 777.97, 1,073.60 and 428.66

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Solution

The fourth proportional to 777.97, 1,073.60 and 428.66 is: 591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.97 : 1,073.60 = 428.66 : x
  2. Step 2: Convert to fraction form
    777.97/1,073.60 = 428.66/x
  3. Step 3: Cross multiply
    777.97x = 1,073.60 × 428.66
  4. Step 4: Simplify right side
    777.97x = 460,209.91
  5. Step 5: Solve for x
    x = 460,209.91/777.97
  6. Step 6: Final answer
    x = 591.55

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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.