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Finding the Fourth Proportional to 28,339.52, 39,108.52 and 15,764

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Solution

The fourth proportional to 28,339.52, 39,108.52 and 15,764 is: 21,754.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,339.52 : 39,108.52 = 15,764 : x
  2. Step 2: Convert to fraction form
    28,339.52/39,108.52 = 15,764/x
  3. Step 3: Cross multiply
    28,339.52x = 39,108.52 × 15,764
  4. Step 4: Simplify right side
    28,339.52x = 616,506,709.28
  5. Step 5: Solve for x
    x = 616,506,709.28/28,339.52
  6. Step 6: Final answer
    x = 21,754.31

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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.