Home / 39,078.40-53,928.12-21,173.86

Finding the Fourth Proportional to 39,078.40, 53,928.12 and 21,173.86

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Solution

The fourth proportional to 39,078.40, 53,928.12 and 21,173.86 is: 29,219.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,078.40 : 53,928.12 = 21,173.86 : x
  2. Step 2: Convert to fraction form
    39,078.40/53,928.12 = 21,173.86/x
  3. Step 3: Cross multiply
    39,078.40x = 53,928.12 × 21,173.86
  4. Step 4: Simplify right side
    39,078.40x = 1,141,866,462.94
  5. Step 5: Solve for x
    x = 1,141,866,462.94/39,078.40
  6. Step 6: Final answer
    x = 29,219.89

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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.