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Finding the Fourth Proportional to 1,325.81, 1,986.83 and 631.91

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Solution

The fourth proportional to 1,325.81, 1,986.83 and 631.91 is: 946.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.81 : 1,986.83 = 631.91 : x
  2. Step 2: Convert to fraction form
    1,325.81/1,986.83 = 631.91/x
  3. Step 3: Cross multiply
    1,325.81x = 1,986.83 × 631.91
  4. Step 4: Simplify right side
    1,325.81x = 1,255,501.92
  5. Step 5: Solve for x
    x = 1,255,501.92/1,325.81
  6. Step 6: Final answer
    x = 946.97

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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.