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Finding the Fourth Proportional to 2,921.70, 4,383.16 and 947.48

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Solution

The fourth proportional to 2,921.70, 4,383.16 and 947.48 is: 1,421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,921.70 : 4,383.16 = 947.48 : x
  2. Step 2: Convert to fraction form
    2,921.70/4,383.16 = 947.48/x
  3. Step 3: Cross multiply
    2,921.70x = 4,383.16 × 947.48
  4. Step 4: Simplify right side
    2,921.70x = 4,152,956.44
  5. Step 5: Solve for x
    x = 4,152,956.44/2,921.70
  6. Step 6: Final answer
    x = 1,421.42

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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.