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Finding the Fourth Proportional to 12,900.51, 19,359.40 and 4,692.51

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Solution

The fourth proportional to 12,900.51, 19,359.40 and 4,692.51 is: 7,041.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,900.51 : 19,359.40 = 4,692.51 : x
  2. Step 2: Convert to fraction form
    12,900.51/19,359.40 = 4,692.51/x
  3. Step 3: Cross multiply
    12,900.51x = 19,359.40 × 4,692.51
  4. Step 4: Simplify right side
    12,900.51x = 90,844,178.09
  5. Step 5: Solve for x
    x = 90,844,178.09/12,900.51
  6. Step 6: Final answer
    x = 7,041.91

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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.