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Finding the Fourth Proportional to 28,339.88, 39,109.03 and 15,764.63

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Solution

The fourth proportional to 28,339.88, 39,109.03 and 15,764.63 is: 21,755.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,339.88 : 39,109.03 = 15,764.63 : x
  2. Step 2: Convert to fraction form
    28,339.88/39,109.03 = 15,764.63/x
  3. Step 3: Cross multiply
    28,339.88x = 39,109.03 × 15,764.63
  4. Step 4: Simplify right side
    28,339.88x = 616,539,152.65
  5. Step 5: Solve for x
    x = 616,539,152.65/28,339.88
  6. Step 6: Final answer
    x = 21,755.18

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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.