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Finding the Fourth Proportional to 338,953.74, 508,128.48 and 128,739.30

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Solution

The fourth proportional to 338,953.74, 508,128.48 and 128,739.30 is: 192,994.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,953.74 : 508,128.48 = 128,739.30 : x
  2. Step 2: Convert to fraction form
    338,953.74/508,128.48 = 128,739.30/x
  3. Step 3: Cross multiply
    338,953.74x = 508,128.48 × 128,739.30
  4. Step 4: Simplify right side
    338,953.74x = 65,416,104,825.26
  5. Step 5: Solve for x
    x = 65,416,104,825.26/338,953.74
  6. Step 6: Final answer
    x = 192,994.20

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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.