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Finding the Fourth Proportional to 18,815.70, 28,223.55 and 7,128.30

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Solution

The fourth proportional to 18,815.70, 28,223.55 and 7,128.30 is: 10,692.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.70 : 28,223.55 = 7,128.30 : x
  2. Step 2: Convert to fraction form
    18,815.70/28,223.55 = 7,128.30/x
  3. Step 3: Cross multiply
    18,815.70x = 28,223.55 × 7,128.30
  4. Step 4: Simplify right side
    18,815.70x = 201,185,931.47
  5. Step 5: Solve for x
    x = 201,185,931.47/18,815.70
  6. Step 6: Final answer
    x = 10,692.45

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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.