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Finding the Fourth Proportional to 2,106.36, 3,159.86 and 645.35

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Solution

The fourth proportional to 2,106.36, 3,159.86 and 645.35 is: 968.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,106.36 : 3,159.86 = 645.35 : x
  2. Step 2: Convert to fraction form
    2,106.36/3,159.86 = 645.35/x
  3. Step 3: Cross multiply
    2,106.36x = 3,159.86 × 645.35
  4. Step 4: Simplify right side
    2,106.36x = 2,039,196.62
  5. Step 5: Solve for x
    x = 2,039,196.62/2,106.36
  6. Step 6: Final answer
    x = 968.11

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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.