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Finding the Fourth Proportional to 2,815.53, 4,221.86 and 940.74

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Solution

The fourth proportional to 2,815.53, 4,221.86 and 940.74 is: 1,410.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.53 : 4,221.86 = 940.74 : x
  2. Step 2: Convert to fraction form
    2,815.53/4,221.86 = 940.74/x
  3. Step 3: Cross multiply
    2,815.53x = 4,221.86 × 940.74
  4. Step 4: Simplify right side
    2,815.53x = 3,971,681.24
  5. Step 5: Solve for x
    x = 3,971,681.24/2,815.53
  6. Step 6: Final answer
    x = 1,410.64

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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.