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Finding the Fourth Proportional to 28,354, 39,128.52 and 15,779.56

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Solution

The fourth proportional to 28,354, 39,128.52 and 15,779.56 is: 21,775.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,354 : 39,128.52 = 15,779.56 : x
  2. Step 2: Convert to fraction form
    28,354/39,128.52 = 15,779.56/x
  3. Step 3: Cross multiply
    28,354x = 39,128.52 × 15,779.56
  4. Step 4: Simplify right side
    28,354x = 617,430,829.05
  5. Step 5: Solve for x
    x = 617,430,829.05/28,354
  6. Step 6: Final answer
    x = 21,775.79

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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.