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Finding the Fourth Proportional to 14,700.87, 20,287.21 and 7,986.49

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Solution

The fourth proportional to 14,700.87, 20,287.21 and 7,986.49 is: 11,021.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,700.87 : 20,287.21 = 7,986.49 : x
  2. Step 2: Convert to fraction form
    14,700.87/20,287.21 = 7,986.49/x
  3. Step 3: Cross multiply
    14,700.87x = 20,287.21 × 7,986.49
  4. Step 4: Simplify right side
    14,700.87x = 162,023,498.36
  5. Step 5: Solve for x
    x = 162,023,498.36/14,700.87
  6. Step 6: Final answer
    x = 11,021.36

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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.