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Finding the Fourth Proportional to 1,955.64, 2,930.86 and 858.63

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Solution

The fourth proportional to 1,955.64, 2,930.86 and 858.63 is: 1,286.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.64 : 2,930.86 = 858.63 : x
  2. Step 2: Convert to fraction form
    1,955.64/2,930.86 = 858.63/x
  3. Step 3: Cross multiply
    1,955.64x = 2,930.86 × 858.63
  4. Step 4: Simplify right side
    1,955.64x = 2,516,524.32
  5. Step 5: Solve for x
    x = 2,516,524.32/1,955.64
  6. Step 6: Final answer
    x = 1,286.80

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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.