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Finding the Fourth Proportional to 3,138.88, 4,708.36 and 947.48

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Solution

The fourth proportional to 3,138.88, 4,708.36 and 947.48 is: 1,421.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.88 : 4,708.36 = 947.48 : x
  2. Step 2: Convert to fraction form
    3,138.88/4,708.36 = 947.48/x
  3. Step 3: Cross multiply
    3,138.88x = 4,708.36 × 947.48
  4. Step 4: Simplify right side
    3,138.88x = 4,461,076.93
  5. Step 5: Solve for x
    x = 4,461,076.93/3,138.88
  6. Step 6: Final answer
    x = 1,421.23

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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.