Home / 28,257.81-39,010.19-21,870.15

Finding the Fourth Proportional to 28,257.81, 39,010.19 and 21,870.15

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Solution

The fourth proportional to 28,257.81, 39,010.19 and 21,870.15 is: 30,191.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,257.81 : 39,010.19 = 21,870.15 : x
  2. Step 2: Convert to fraction form
    28,257.81/39,010.19 = 21,870.15/x
  3. Step 3: Cross multiply
    28,257.81x = 39,010.19 × 21,870.15
  4. Step 4: Simplify right side
    28,257.81x = 853,158,597.48
  5. Step 5: Solve for x
    x = 853,158,597.48/28,257.81
  6. Step 6: Final answer
    x = 30,191.96

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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.