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Finding the Fourth Proportional to 21,000.61, 28,980.33 and 12,047.54

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Solution

The fourth proportional to 21,000.61, 28,980.33 and 12,047.54 is: 16,625.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.61 : 28,980.33 = 12,047.54 : x
  2. Step 2: Convert to fraction form
    21,000.61/28,980.33 = 12,047.54/x
  3. Step 3: Cross multiply
    21,000.61x = 28,980.33 × 12,047.54
  4. Step 4: Simplify right side
    21,000.61x = 349,141,684.89
  5. Step 5: Solve for x
    x = 349,141,684.89/21,000.61
  6. Step 6: Final answer
    x = 16,625.31

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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.