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Finding the Fourth Proportional to 138,728.40, 208,054.20 and 55,630.80

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Solution

The fourth proportional to 138,728.40, 208,054.20 and 55,630.80 is: 83,430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,728.40 : 208,054.20 = 55,630.80 : x
  2. Step 2: Convert to fraction form
    138,728.40/208,054.20 = 55,630.80/x
  3. Step 3: Cross multiply
    138,728.40x = 208,054.20 × 55,630.80
  4. Step 4: Simplify right side
    138,728.40x = 11,574,221,589.36
  5. Step 5: Solve for x
    x = 11,574,221,589.36/138,728.40
  6. Step 6: Final answer
    x = 83,430.80

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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.