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Finding the Fourth Proportional to 138,928.80, 208,004.40 and 138,928.80

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Solution

The fourth proportional to 138,928.80, 208,004.40 and 138,928.80 is: 208,004.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,928.80 : 208,004.40 = 138,928.80 : x
  2. Step 2: Convert to fraction form
    138,928.80/208,004.40 = 138,928.80/x
  3. Step 3: Cross multiply
    138,928.80x = 208,004.40 × 138,928.80
  4. Step 4: Simplify right side
    138,928.80x = 28,897,801,686.72
  5. Step 5: Solve for x
    x = 28,897,801,686.72/138,928.80
  6. Step 6: Final answer
    x = 208,004.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.