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Finding the Fourth Proportional to 1,091.22, 1,638.48 and 545.28

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Solution

The fourth proportional to 1,091.22, 1,638.48 and 545.28 is: 818.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.22 : 1,638.48 = 545.28 : x
  2. Step 2: Convert to fraction form
    1,091.22/1,638.48 = 545.28/x
  3. Step 3: Cross multiply
    1,091.22x = 1,638.48 × 545.28
  4. Step 4: Simplify right side
    1,091.22x = 893,430.37
  5. Step 5: Solve for x
    x = 893,430.37/1,091.22
  6. Step 6: Final answer
    x = 818.74

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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.