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Finding the Fourth Proportional to 1,641.22, 2,460.54 and 861.08

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Solution

The fourth proportional to 1,641.22, 2,460.54 and 861.08 is: 1,290.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,641.22 : 2,460.54 = 861.08 : x
  2. Step 2: Convert to fraction form
    1,641.22/2,460.54 = 861.08/x
  3. Step 3: Cross multiply
    1,641.22x = 2,460.54 × 861.08
  4. Step 4: Simplify right side
    1,641.22x = 2,118,721.78
  5. Step 5: Solve for x
    x = 2,118,721.78/1,641.22
  6. Step 6: Final answer
    x = 1,290.94

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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.