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Finding the Fourth Proportional to 1,394.15, 2,091.45 and 561.23

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Solution

The fourth proportional to 1,394.15, 2,091.45 and 561.23 is: 841.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.15 : 2,091.45 = 561.23 : x
  2. Step 2: Convert to fraction form
    1,394.15/2,091.45 = 561.23/x
  3. Step 3: Cross multiply
    1,394.15x = 2,091.45 × 561.23
  4. Step 4: Simplify right side
    1,394.15x = 1,173,784.48
  5. Step 5: Solve for x
    x = 1,173,784.48/1,394.15
  6. Step 6: Final answer
    x = 841.94

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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.