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Finding the Fourth Proportional to 18,726.96, 28,075.20 and 12,788.88

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Solution

The fourth proportional to 18,726.96, 28,075.20 and 12,788.88 is: 19,172.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726.96 : 28,075.20 = 12,788.88 : x
  2. Step 2: Convert to fraction form
    18,726.96/28,075.20 = 12,788.88/x
  3. Step 3: Cross multiply
    18,726.96x = 28,075.20 × 12,788.88
  4. Step 4: Simplify right side
    18,726.96x = 359,050,363.78
  5. Step 5: Solve for x
    x = 359,050,363.78/18,726.96
  6. Step 6: Final answer
    x = 19,172.91

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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.