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Finding the Fourth Proportional to 21,283.60, 31,939.80 and 9,590.80

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Solution

The fourth proportional to 21,283.60, 31,939.80 and 9,590.80 is: 14,392.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,283.60 : 31,939.80 = 9,590.80 : x
  2. Step 2: Convert to fraction form
    21,283.60/31,939.80 = 9,590.80/x
  3. Step 3: Cross multiply
    21,283.60x = 31,939.80 × 9,590.80
  4. Step 4: Simplify right side
    21,283.60x = 306,328,233.84
  5. Step 5: Solve for x
    x = 306,328,233.84/21,283.60
  6. Step 6: Final answer
    x = 14,392.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.