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Finding the Fourth Proportional to 13,319.99, 19,974.18 and 7,078.51

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Solution

The fourth proportional to 13,319.99, 19,974.18 and 7,078.51 is: 10,614.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,319.99 : 19,974.18 = 7,078.51 : x
  2. Step 2: Convert to fraction form
    13,319.99/19,974.18 = 7,078.51/x
  3. Step 3: Cross multiply
    13,319.99x = 19,974.18 × 7,078.51
  4. Step 4: Simplify right side
    13,319.99x = 141,387,332.21
  5. Step 5: Solve for x
    x = 141,387,332.21/13,319.99
  6. Step 6: Final answer
    x = 10,614.67

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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.