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Finding the Fourth Proportional to 21,007.62, 28,981.07 and 14,199.46

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Solution

The fourth proportional to 21,007.62, 28,981.07 and 14,199.46 is: 19,588.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.62 : 28,981.07 = 14,199.46 : x
  2. Step 2: Convert to fraction form
    21,007.62/28,981.07 = 14,199.46/x
  3. Step 3: Cross multiply
    21,007.62x = 28,981.07 × 14,199.46
  4. Step 4: Simplify right side
    21,007.62x = 411,515,544.22
  5. Step 5: Solve for x
    x = 411,515,544.22/21,007.62
  6. Step 6: Final answer
    x = 19,588.87

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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.