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Finding the Fourth Proportional to 3,076.81, 4,615.19 and 768.31

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Solution

The fourth proportional to 3,076.81, 4,615.19 and 768.31 is: 1,152.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,076.81 : 4,615.19 = 768.31 : x
  2. Step 2: Convert to fraction form
    3,076.81/4,615.19 = 768.31/x
  3. Step 3: Cross multiply
    3,076.81x = 4,615.19 × 768.31
  4. Step 4: Simplify right side
    3,076.81x = 3,545,881.25
  5. Step 5: Solve for x
    x = 3,545,881.25/3,076.81
  6. Step 6: Final answer
    x = 1,152.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.