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Finding the Fourth Proportional to 19,159.80, 28,763.10 and 12,139.80

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Solution

The fourth proportional to 19,159.80, 28,763.10 and 12,139.80 is: 18,224.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,159.80 : 28,763.10 = 12,139.80 : x
  2. Step 2: Convert to fraction form
    19,159.80/28,763.10 = 12,139.80/x
  3. Step 3: Cross multiply
    19,159.80x = 28,763.10 × 12,139.80
  4. Step 4: Simplify right side
    19,159.80x = 349,178,281.38
  5. Step 5: Solve for x
    x = 349,178,281.38/19,159.80
  6. Step 6: Final answer
    x = 18,224.53

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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.