Home / 1,431.40-1,975.44-841.72

Finding the Fourth Proportional to 1,431.40, 1,975.44 and 841.72

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Solution

The fourth proportional to 1,431.40, 1,975.44 and 841.72 is: 1,161.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.40 : 1,975.44 = 841.72 : x
  2. Step 2: Convert to fraction form
    1,431.40/1,975.44 = 841.72/x
  3. Step 3: Cross multiply
    1,431.40x = 1,975.44 × 841.72
  4. Step 4: Simplify right side
    1,431.40x = 1,662,767.36
  5. Step 5: Solve for x
    x = 1,662,767.36/1,431.40
  6. Step 6: Final answer
    x = 1,161.64

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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.