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Finding the Fourth Proportional to 1,391.77, 2,089.77 and 874.99

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Solution

The fourth proportional to 1,391.77, 2,089.77 and 874.99 is: 1,313.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.77 : 2,089.77 = 874.99 : x
  2. Step 2: Convert to fraction form
    1,391.77/2,089.77 = 874.99/x
  3. Step 3: Cross multiply
    1,391.77x = 2,089.77 × 874.99
  4. Step 4: Simplify right side
    1,391.77x = 1,828,527.85
  5. Step 5: Solve for x
    x = 1,828,527.85/1,391.77
  6. Step 6: Final answer
    x = 1,313.81

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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.