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Finding the Fourth Proportional to 1,081.74, 1,621.47 and 561.19

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Solution

The fourth proportional to 1,081.74, 1,621.47 and 561.19 is: 841.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.74 : 1,621.47 = 561.19 : x
  2. Step 2: Convert to fraction form
    1,081.74/1,621.47 = 561.19/x
  3. Step 3: Cross multiply
    1,081.74x = 1,621.47 × 561.19
  4. Step 4: Simplify right side
    1,081.74x = 909,952.75
  5. Step 5: Solve for x
    x = 909,952.75/1,081.74
  6. Step 6: Final answer
    x = 841.19

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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.