Home / 1,029.87-1,420.20-939.96

Finding the Fourth Proportional to 1,029.87, 1,420.20 and 939.96

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Solution

The fourth proportional to 1,029.87, 1,420.20 and 939.96 is: 1,296.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.87 : 1,420.20 = 939.96 : x
  2. Step 2: Convert to fraction form
    1,029.87/1,420.20 = 939.96/x
  3. Step 3: Cross multiply
    1,029.87x = 1,420.20 × 939.96
  4. Step 4: Simplify right side
    1,029.87x = 1,334,931.19
  5. Step 5: Solve for x
    x = 1,334,931.19/1,029.87
  6. Step 6: Final answer
    x = 1,296.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.