Home / 86,018,770.40-128,878,856.40-80,643,999.20

Finding the Fourth Proportional to 86,018,770.40, 128,878,856.40 and 80,643,999.20

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Solution

The fourth proportional to 86,018,770.40, 128,878,856.40 and 80,643,999.20 is: 120,826,028.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,018,770.40 : 128,878,856.40 = 80,643,999.20 : x
  2. Step 2: Convert to fraction form
    86,018,770.40/128,878,856.40 = 80,643,999.20/x
  3. Step 3: Cross multiply
    86,018,770.40x = 128,878,856.40 × 80,643,999.20
  4. Step 4: Simplify right side
    86,018,770.40x = 10,393,306,392,418,516
  5. Step 5: Solve for x
    x = 10,393,306,392,418,516/86,018,770.40
  6. Step 6: Final answer
    x = 120,826,028.37

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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.