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Finding the Fourth Proportional to 19,279.31, 28,905.80 and 10,274.78

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Solution

The fourth proportional to 19,279.31, 28,905.80 and 10,274.78 is: 15,405.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,279.31 : 28,905.80 = 10,274.78 : x
  2. Step 2: Convert to fraction form
    19,279.31/28,905.80 = 10,274.78/x
  3. Step 3: Cross multiply
    19,279.31x = 28,905.80 × 10,274.78
  4. Step 4: Simplify right side
    19,279.31x = 297,000,756.61
  5. Step 5: Solve for x
    x = 297,000,756.61/19,279.31
  6. Step 6: Final answer
    x = 15,405.15

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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.