Home / 1,918.86-2,878.11-620.34

Finding the Fourth Proportional to 1,918.86, 2,878.11 and 620.34

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Solution

The fourth proportional to 1,918.86, 2,878.11 and 620.34 is: 930.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.86 : 2,878.11 = 620.34 : x
  2. Step 2: Convert to fraction form
    1,918.86/2,878.11 = 620.34/x
  3. Step 3: Cross multiply
    1,918.86x = 2,878.11 × 620.34
  4. Step 4: Simplify right side
    1,918.86x = 1,785,406.76
  5. Step 5: Solve for x
    x = 1,785,406.76/1,918.86
  6. Step 6: Final answer
    x = 930.45

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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.