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Finding the Fourth Proportional to 10,385.80, 15,578.70 and 3,809.80

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Solution

The fourth proportional to 10,385.80, 15,578.70 and 3,809.80 is: 5,714.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,385.80 : 15,578.70 = 3,809.80 : x
  2. Step 2: Convert to fraction form
    10,385.80/15,578.70 = 3,809.80/x
  3. Step 3: Cross multiply
    10,385.80x = 15,578.70 × 3,809.80
  4. Step 4: Simplify right side
    10,385.80x = 59,351,731.26
  5. Step 5: Solve for x
    x = 59,351,731.26/10,385.80
  6. Step 6: Final answer
    x = 5,714.70

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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.