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Finding the Fourth Proportional to 21,007.01, 28,972.01 and 12,621.89

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Solution

The fourth proportional to 21,007.01, 28,972.01 and 12,621.89 is: 17,407.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.01 : 28,972.01 = 12,621.89 : x
  2. Step 2: Convert to fraction form
    21,007.01/28,972.01 = 12,621.89/x
  3. Step 3: Cross multiply
    21,007.01x = 28,972.01 × 12,621.89
  4. Step 4: Simplify right side
    21,007.01x = 365,681,409.99
  5. Step 5: Solve for x
    x = 365,681,409.99/21,007.01
  6. Step 6: Final answer
    x = 17,407.59

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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.