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Finding the Fourth Proportional to 14,289.20, 19,719 and 8,001.20

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Solution

The fourth proportional to 14,289.20, 19,719 and 8,001.20 is: 11,041.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,289.20 : 19,719 = 8,001.20 : x
  2. Step 2: Convert to fraction form
    14,289.20/19,719 = 8,001.20/x
  3. Step 3: Cross multiply
    14,289.20x = 19,719 × 8,001.20
  4. Step 4: Simplify right side
    14,289.20x = 157,775,662.80
  5. Step 5: Solve for x
    x = 157,775,662.80/14,289.20
  6. Step 6: Final answer
    x = 11,041.60

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.