Home / 86,018,770.90-128,878,857.15-80,643,999.70

Finding the Fourth Proportional to 86,018,770.90, 128,878,857.15 and 80,643,999.70

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Solution

The fourth proportional to 86,018,770.90, 128,878,857.15 and 80,643,999.70 is: 120,826,029.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,018,770.90 : 128,878,857.15 = 80,643,999.70 : x
  2. Step 2: Convert to fraction form
    86,018,770.90/128,878,857.15 = 80,643,999.70/x
  3. Step 3: Cross multiply
    86,018,770.90x = 128,878,857.15 × 80,643,999.70
  4. Step 4: Simplify right side
    86,018,770.90x = 10,393,306,517,340,944
  5. Step 5: Solve for x
    x = 10,393,306,517,340,944/86,018,770.90
  6. Step 6: Final answer
    x = 120,826,029.12

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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.