Home / 1,490.40-2,057.72-931.64

Finding the Fourth Proportional to 1,490.40, 2,057.72 and 931.64

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Solution

The fourth proportional to 1,490.40, 2,057.72 and 931.64 is: 1,286.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.40 : 2,057.72 = 931.64 : x
  2. Step 2: Convert to fraction form
    1,490.40/2,057.72 = 931.64/x
  3. Step 3: Cross multiply
    1,490.40x = 2,057.72 × 931.64
  4. Step 4: Simplify right side
    1,490.40x = 1,917,039.31
  5. Step 5: Solve for x
    x = 1,917,039.31/1,490.40
  6. Step 6: Final answer
    x = 1,286.26

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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.