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Finding the Fourth Proportional to 1,406.22, 2,109.55 and 528.79

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Solution

The fourth proportional to 1,406.22, 2,109.55 and 528.79 is: 793.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.22 : 2,109.55 = 528.79 : x
  2. Step 2: Convert to fraction form
    1,406.22/2,109.55 = 528.79/x
  3. Step 3: Cross multiply
    1,406.22x = 2,109.55 × 528.79
  4. Step 4: Simplify right side
    1,406.22x = 1,115,498.40
  5. Step 5: Solve for x
    x = 1,115,498.40/1,406.22
  6. Step 6: Final answer
    x = 793.26

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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.