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Finding the Fourth Proportional to 21,000.78, 28,981.74 and 12,051.09

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Solution

The fourth proportional to 21,000.78, 28,981.74 and 12,051.09 is: 16,630.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.78 : 28,981.74 = 12,051.09 : x
  2. Step 2: Convert to fraction form
    21,000.78/28,981.74 = 12,051.09/x
  3. Step 3: Cross multiply
    21,000.78x = 28,981.74 × 12,051.09
  4. Step 4: Simplify right side
    21,000.78x = 349,261,557.10
  5. Step 5: Solve for x
    x = 349,261,557.10/21,000.78
  6. Step 6: Final answer
    x = 16,630.89

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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.