Home / 1,081.45-1,621.41-561.25

Finding the Fourth Proportional to 1,081.45, 1,621.41 and 561.25

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Solution

The fourth proportional to 1,081.45, 1,621.41 and 561.25 is: 841.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.45 : 1,621.41 = 561.25 : x
  2. Step 2: Convert to fraction form
    1,081.45/1,621.41 = 561.25/x
  3. Step 3: Cross multiply
    1,081.45x = 1,621.41 × 561.25
  4. Step 4: Simplify right side
    1,081.45x = 910,016.36
  5. Step 5: Solve for x
    x = 910,016.36/1,081.45
  6. Step 6: Final answer
    x = 841.48

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Double scale
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1.5x scale

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.