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Finding the Fourth Proportional to 1,951.72, 2,928.29 and 856.40

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Solution

The fourth proportional to 1,951.72, 2,928.29 and 856.40 is: 1,284.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,951.72 : 2,928.29 = 856.40 : x
  2. Step 2: Convert to fraction form
    1,951.72/2,928.29 = 856.40/x
  3. Step 3: Cross multiply
    1,951.72x = 2,928.29 × 856.40
  4. Step 4: Simplify right side
    1,951.72x = 2,507,768.63
  5. Step 5: Solve for x
    x = 2,507,768.63/1,951.72
  6. Step 6: Final answer
    x = 1,284.90

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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.