Home / 1,938.84-2,907.87-640.02

Finding the Fourth Proportional to 1,938.84, 2,907.87 and 640.02

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Solution

The fourth proportional to 1,938.84, 2,907.87 and 640.02 is: 959.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.84 : 2,907.87 = 640.02 : x
  2. Step 2: Convert to fraction form
    1,938.84/2,907.87 = 640.02/x
  3. Step 3: Cross multiply
    1,938.84x = 2,907.87 × 640.02
  4. Step 4: Simplify right side
    1,938.84x = 1,861,094.96
  5. Step 5: Solve for x
    x = 1,861,094.96/1,938.84
  6. Step 6: Final answer
    x = 959.90

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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.