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Finding the Fourth Proportional to 1,958.94, 2,938.55 and 572.31

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Solution

The fourth proportional to 1,958.94, 2,938.55 and 572.31 is: 858.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,958.94 : 2,938.55 = 572.31 : x
  2. Step 2: Convert to fraction form
    1,958.94/2,938.55 = 572.31/x
  3. Step 3: Cross multiply
    1,958.94x = 2,938.55 × 572.31
  4. Step 4: Simplify right side
    1,958.94x = 1,681,758.69
  5. Step 5: Solve for x
    x = 1,681,758.69/1,958.94
  6. Step 6: Final answer
    x = 858.50

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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.