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Finding the Fourth Proportional to 18,907.88, 28,324.12 and 12,970.20

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Solution

The fourth proportional to 18,907.88, 28,324.12 and 12,970.20 is: 19,429.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,907.88 : 28,324.12 = 12,970.20 : x
  2. Step 2: Convert to fraction form
    18,907.88/28,324.12 = 12,970.20/x
  3. Step 3: Cross multiply
    18,907.88x = 28,324.12 × 12,970.20
  4. Step 4: Simplify right side
    18,907.88x = 367,369,501.22
  5. Step 5: Solve for x
    x = 367,369,501.22/18,907.88
  6. Step 6: Final answer
    x = 19,429.44

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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.