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Finding the Fourth Proportional to 777.33, 1,072.55 and 478.55

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Solution

The fourth proportional to 777.33, 1,072.55 and 478.55 is: 660.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.33 : 1,072.55 = 478.55 : x
  2. Step 2: Convert to fraction form
    777.33/1,072.55 = 478.55/x
  3. Step 3: Cross multiply
    777.33x = 1,072.55 × 478.55
  4. Step 4: Simplify right side
    777.33x = 513,261.05
  5. Step 5: Solve for x
    x = 513,261.05/777.33
  6. Step 6: Final answer
    x = 660.29

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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.