Home / 30,578.91-42,222.78-19,828.89

Finding the Fourth Proportional to 30,578.91, 42,222.78 and 19,828.89

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Solution

The fourth proportional to 30,578.91, 42,222.78 and 19,828.89 is: 27,379.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,578.91 : 42,222.78 = 19,828.89 : x
  2. Step 2: Convert to fraction form
    30,578.91/42,222.78 = 19,828.89/x
  3. Step 3: Cross multiply
    30,578.91x = 42,222.78 × 19,828.89
  4. Step 4: Simplify right side
    30,578.91x = 837,230,860.11
  5. Step 5: Solve for x
    x = 837,230,860.11/30,578.91
  6. Step 6: Final answer
    x = 27,379.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.