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Finding the Fourth Proportional to 3,271.95, 4,907.79 and 931.95

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Solution

The fourth proportional to 3,271.95, 4,907.79 and 931.95 is: 1,397.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,271.95 : 4,907.79 = 931.95 : x
  2. Step 2: Convert to fraction form
    3,271.95/4,907.79 = 931.95/x
  3. Step 3: Cross multiply
    3,271.95x = 4,907.79 × 931.95
  4. Step 4: Simplify right side
    3,271.95x = 4,573,814.89
  5. Step 5: Solve for x
    x = 4,573,814.89/3,271.95
  6. Step 6: Final answer
    x = 1,397.89

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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.