Home / 84,978,009.20-127,467,013.80-78,458,999.60

Finding the Fourth Proportional to 84,978,009.20, 127,467,013.80 and 78,458,999.60

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Solution

The fourth proportional to 84,978,009.20, 127,467,013.80 and 78,458,999.60 is: 117,688,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,978,009.20 : 127,467,013.80 = 78,458,999.60 : x
  2. Step 2: Convert to fraction form
    84,978,009.20/127,467,013.80 = 78,458,999.60/x
  3. Step 3: Cross multiply
    84,978,009.20x = 127,467,013.80 × 78,458,999.60
  4. Step 4: Simplify right side
    84,978,009.20x = 10,000,934,384,747,394
  5. Step 5: Solve for x
    x = 10,000,934,384,747,394/84,978,009.20
  6. Step 6: Final answer
    x = 117,688,499.40

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Similar ratio
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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.