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Finding the Fourth Proportional to 14,648.31, 21,980.21 and 7,989.61

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Solution

The fourth proportional to 14,648.31, 21,980.21 and 7,989.61 is: 11,988.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,648.31 : 21,980.21 = 7,989.61 : x
  2. Step 2: Convert to fraction form
    14,648.31/21,980.21 = 7,989.61/x
  3. Step 3: Cross multiply
    14,648.31x = 21,980.21 × 7,989.61
  4. Step 4: Simplify right side
    14,648.31x = 175,613,305.62
  5. Step 5: Solve for x
    x = 175,613,305.62/14,648.31
  6. Step 6: Final answer
    x = 11,988.64

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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.