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Finding the Fourth Proportional to 228,918.88, 315,907.05 and 128,316.88

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Solution

The fourth proportional to 228,918.88, 315,907.05 and 128,316.88 is: 177,076.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,918.88 : 315,907.05 = 128,316.88 : x
  2. Step 2: Convert to fraction form
    228,918.88/315,907.05 = 128,316.88/x
  3. Step 3: Cross multiply
    228,918.88x = 315,907.05 × 128,316.88
  4. Step 4: Simplify right side
    228,918.88x = 40,536,207,026.00
  5. Step 5: Solve for x
    x = 40,536,207,026.00/228,918.88
  6. Step 6: Final answer
    x = 177,076.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.