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Finding the Fourth Proportional to 1,938.46, 2,907.66 and 785.02

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Solution

The fourth proportional to 1,938.46, 2,907.66 and 785.02 is: 1,177.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.46 : 2,907.66 = 785.02 : x
  2. Step 2: Convert to fraction form
    1,938.46/2,907.66 = 785.02/x
  3. Step 3: Cross multiply
    1,938.46x = 2,907.66 × 785.02
  4. Step 4: Simplify right side
    1,938.46x = 2,282,571.25
  5. Step 5: Solve for x
    x = 2,282,571.25/1,938.46
  6. Step 6: Final answer
    x = 1,177.52

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1.5x scale

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.