Home / 28,905.90-39,889.90-20,304.18

Finding the Fourth Proportional to 28,905.90, 39,889.90 and 20,304.18

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Solution

The fourth proportional to 28,905.90, 39,889.90 and 20,304.18 is: 28,019.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.90 : 39,889.90 = 20,304.18 : x
  2. Step 2: Convert to fraction form
    28,905.90/39,889.90 = 20,304.18/x
  3. Step 3: Cross multiply
    28,905.90x = 39,889.90 × 20,304.18
  4. Step 4: Simplify right side
    28,905.90x = 809,931,709.78
  5. Step 5: Solve for x
    x = 809,931,709.78/28,905.90
  6. Step 6: Final answer
    x = 28,019.60

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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.