Home / 1,431.20-1,975.08-841.75

Finding the Fourth Proportional to 1,431.20, 1,975.08 and 841.75

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Solution

The fourth proportional to 1,431.20, 1,975.08 and 841.75 is: 1,161.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.20 : 1,975.08 = 841.75 : x
  2. Step 2: Convert to fraction form
    1,431.20/1,975.08 = 841.75/x
  3. Step 3: Cross multiply
    1,431.20x = 1,975.08 × 841.75
  4. Step 4: Simplify right side
    1,431.20x = 1,662,523.59
  5. Step 5: Solve for x
    x = 1,662,523.59/1,431.20
  6. Step 6: Final answer
    x = 1,161.63

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1.5x scale

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.