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Finding the Fourth Proportional to 138,905.20, 208,357.80 and 45,420.40

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Solution

The fourth proportional to 138,905.20, 208,357.80 and 45,420.40 is: 68,130.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,905.20 : 208,357.80 = 45,420.40 : x
  2. Step 2: Convert to fraction form
    138,905.20/208,357.80 = 45,420.40/x
  3. Step 3: Cross multiply
    138,905.20x = 208,357.80 × 45,420.40
  4. Step 4: Simplify right side
    138,905.20x = 9,463,694,619.12
  5. Step 5: Solve for x
    x = 9,463,694,619.12/138,905.20
  6. Step 6: Final answer
    x = 68,130.60

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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.