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Finding the Fourth Proportional to 39,078.70, 53,928.53 and 21,174.19

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Solution

The fourth proportional to 39,078.70, 53,928.53 and 21,174.19 is: 29,220.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,078.70 : 53,928.53 = 21,174.19 : x
  2. Step 2: Convert to fraction form
    39,078.70/53,928.53 = 21,174.19/x
  3. Step 3: Cross multiply
    39,078.70x = 53,928.53 × 21,174.19
  4. Step 4: Simplify right side
    39,078.70x = 1,141,892,779.35
  5. Step 5: Solve for x
    x = 1,141,892,779.35/39,078.70
  6. Step 6: Final answer
    x = 29,220.34

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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.