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Finding the Fourth Proportional to 926.81, 1,390.20 and 669.92

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Solution

The fourth proportional to 926.81, 1,390.20 and 669.92 is: 1,004.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.81 : 1,390.20 = 669.92 : x
  2. Step 2: Convert to fraction form
    926.81/1,390.20 = 669.92/x
  3. Step 3: Cross multiply
    926.81x = 1,390.20 × 669.92
  4. Step 4: Simplify right side
    926.81x = 931,322.78
  5. Step 5: Solve for x
    x = 931,322.78/926.81
  6. Step 6: Final answer
    x = 1,004.87

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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.