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Finding the Fourth Proportional to 18,826.40, 28,250.80 and 7,140.80

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Solution

The fourth proportional to 18,826.40, 28,250.80 and 7,140.80 is: 10,715.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,826.40 : 28,250.80 = 7,140.80 : x
  2. Step 2: Convert to fraction form
    18,826.40/28,250.80 = 7,140.80/x
  3. Step 3: Cross multiply
    18,826.40x = 28,250.80 × 7,140.80
  4. Step 4: Simplify right side
    18,826.40x = 201,733,312.64
  5. Step 5: Solve for x
    x = 201,733,312.64/18,826.40
  6. Step 6: Final answer
    x = 10,715.45

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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.