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Finding the Fourth Proportional to 28,515.80, 42,692.70 and 26,964.20

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Solution

The fourth proportional to 28,515.80, 42,692.70 and 26,964.20 is: 40,369.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.80 : 42,692.70 = 26,964.20 : x
  2. Step 2: Convert to fraction form
    28,515.80/42,692.70 = 26,964.20/x
  3. Step 3: Cross multiply
    28,515.80x = 42,692.70 × 26,964.20
  4. Step 4: Simplify right side
    28,515.80x = 1,151,174,501.34
  5. Step 5: Solve for x
    x = 1,151,174,501.34/28,515.80
  6. Step 6: Final answer
    x = 40,369.71

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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.