Home / 20,912.40-31,368.60-18,798.30

Finding the Fourth Proportional to 20,912.40, 31,368.60 and 18,798.30

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Solution

The fourth proportional to 20,912.40, 31,368.60 and 18,798.30 is: 28,197.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.40 : 31,368.60 = 18,798.30 : x
  2. Step 2: Convert to fraction form
    20,912.40/31,368.60 = 18,798.30/x
  3. Step 3: Cross multiply
    20,912.40x = 31,368.60 × 18,798.30
  4. Step 4: Simplify right side
    20,912.40x = 589,676,353.38
  5. Step 5: Solve for x
    x = 589,676,353.38/20,912.40
  6. Step 6: Final answer
    x = 28,197.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.