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Finding the Fourth Proportional to 3,888.79, 5,331.64 and 3,818.80

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Solution

The fourth proportional to 3,888.79, 5,331.64 and 3,818.80 is: 5,235.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,888.79 : 5,331.64 = 3,818.80 : x
  2. Step 2: Convert to fraction form
    3,888.79/5,331.64 = 3,818.80/x
  3. Step 3: Cross multiply
    3,888.79x = 5,331.64 × 3,818.80
  4. Step 4: Simplify right side
    3,888.79x = 20,360,466.83
  5. Step 5: Solve for x
    x = 20,360,466.83/3,888.79
  6. Step 6: Final answer
    x = 5,235.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.