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Finding the Fourth Proportional to 1,391.79, 2,087.75 and 775.03

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Solution

The fourth proportional to 1,391.79, 2,087.75 and 775.03 is: 1,162.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.79 : 2,087.75 = 775.03 : x
  2. Step 2: Convert to fraction form
    1,391.79/2,087.75 = 775.03/x
  3. Step 3: Cross multiply
    1,391.79x = 2,087.75 × 775.03
  4. Step 4: Simplify right side
    1,391.79x = 1,618,064.23
  5. Step 5: Solve for x
    x = 1,618,064.23/1,391.79
  6. Step 6: Final answer
    x = 1,162.58

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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.