Home / 28,379.74-39,123.12-19,855.45

Finding the Fourth Proportional to 28,379.74, 39,123.12 and 19,855.45

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Solution

The fourth proportional to 28,379.74, 39,123.12 and 19,855.45 is: 27,371.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.74 : 39,123.12 = 19,855.45 : x
  2. Step 2: Convert to fraction form
    28,379.74/39,123.12 = 19,855.45/x
  3. Step 3: Cross multiply
    28,379.74x = 39,123.12 × 19,855.45
  4. Step 4: Simplify right side
    28,379.74x = 776,807,055.20
  5. Step 5: Solve for x
    x = 776,807,055.20/28,379.74
  6. Step 6: Final answer
    x = 27,371.89

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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.