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Finding the Fourth Proportional to 21,008.40, 28,992.96 and 12,058.80

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Solution

The fourth proportional to 21,008.40, 28,992.96 and 12,058.80 is: 16,641.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.40 : 28,992.96 = 12,058.80 : x
  2. Step 2: Convert to fraction form
    21,008.40/28,992.96 = 12,058.80/x
  3. Step 3: Cross multiply
    21,008.40x = 28,992.96 × 12,058.80
  4. Step 4: Simplify right side
    21,008.40x = 349,620,306.05
  5. Step 5: Solve for x
    x = 349,620,306.05/21,008.40
  6. Step 6: Final answer
    x = 16,641.93

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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.