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Finding the Fourth Proportional to 2,187.86, 3,281.83 and 648.86

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Solution

The fourth proportional to 2,187.86, 3,281.83 and 648.86 is: 973.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.86 : 3,281.83 = 648.86 : x
  2. Step 2: Convert to fraction form
    2,187.86/3,281.83 = 648.86/x
  3. Step 3: Cross multiply
    2,187.86x = 3,281.83 × 648.86
  4. Step 4: Simplify right side
    2,187.86x = 2,129,448.21
  5. Step 5: Solve for x
    x = 2,129,448.21/2,187.86
  6. Step 6: Final answer
    x = 973.30

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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.