Home / 28,538.41-39,420.63-21,905.99

Finding the Fourth Proportional to 28,538.41, 39,420.63 and 21,905.99

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Solution

The fourth proportional to 28,538.41, 39,420.63 and 21,905.99 is: 30,259.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,538.41 : 39,420.63 = 21,905.99 : x
  2. Step 2: Convert to fraction form
    28,538.41/39,420.63 = 21,905.99/x
  3. Step 3: Cross multiply
    28,538.41x = 39,420.63 × 21,905.99
  4. Step 4: Simplify right side
    28,538.41x = 863,548,025.13
  5. Step 5: Solve for x
    x = 863,548,025.13/28,538.41
  6. Step 6: Final answer
    x = 30,259.15

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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.