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Finding the Fourth Proportional to 136,726.80, 205,090.20 and 128,416.20

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Solution

The fourth proportional to 136,726.80, 205,090.20 and 128,416.20 is: 192,624.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,726.80 : 205,090.20 = 128,416.20 : x
  2. Step 2: Convert to fraction form
    136,726.80/205,090.20 = 128,416.20/x
  3. Step 3: Cross multiply
    136,726.80x = 205,090.20 × 128,416.20
  4. Step 4: Simplify right side
    136,726.80x = 26,336,904,141.24
  5. Step 5: Solve for x
    x = 26,336,904,141.24/136,726.80
  6. Step 6: Final answer
    x = 192,624.30

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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.