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Finding the Fourth Proportional to 5,618.74, 7,741.20 and 3,915.64

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Solution

The fourth proportional to 5,618.74, 7,741.20 and 3,915.64 is: 5,394.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,618.74 : 7,741.20 = 3,915.64 : x
  2. Step 2: Convert to fraction form
    5,618.74/7,741.20 = 3,915.64/x
  3. Step 3: Cross multiply
    5,618.74x = 7,741.20 × 3,915.64
  4. Step 4: Simplify right side
    5,618.74x = 30,311,752.37
  5. Step 5: Solve for x
    x = 30,311,752.37/5,618.74
  6. Step 6: Final answer
    x = 5,394.76

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1.5x scale

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.