Home / 3,391.90-5,087.36-1,312.89

Finding the Fourth Proportional to 3,391.90, 5,087.36 and 1,312.89

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Solution

The fourth proportional to 3,391.90, 5,087.36 and 1,312.89 is: 1,969.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,391.90 : 5,087.36 = 1,312.89 : x
  2. Step 2: Convert to fraction form
    3,391.90/5,087.36 = 1,312.89/x
  3. Step 3: Cross multiply
    3,391.90x = 5,087.36 × 1,312.89
  4. Step 4: Simplify right side
    3,391.90x = 6,679,144.07
  5. Step 5: Solve for x
    x = 6,679,144.07/3,391.90
  6. Step 6: Final answer
    x = 1,969.15

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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.