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Finding the Fourth Proportional to 1,406.12, 1,940.60 and 785.12

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Solution

The fourth proportional to 1,406.12, 1,940.60 and 785.12 is: 1,083.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.12 : 1,940.60 = 785.12 : x
  2. Step 2: Convert to fraction form
    1,406.12/1,940.60 = 785.12/x
  3. Step 3: Cross multiply
    1,406.12x = 1,940.60 × 785.12
  4. Step 4: Simplify right side
    1,406.12x = 1,523,603.87
  5. Step 5: Solve for x
    x = 1,523,603.87/1,406.12
  6. Step 6: Final answer
    x = 1,083.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.