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Finding the Fourth Proportional to 426,980.56, 640,459.84 and 138,790.64

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Solution

The fourth proportional to 426,980.56, 640,459.84 and 138,790.64 is: 208,182.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,980.56 : 640,459.84 = 138,790.64 : x
  2. Step 2: Convert to fraction form
    426,980.56/640,459.84 = 138,790.64/x
  3. Step 3: Cross multiply
    426,980.56x = 640,459.84 × 138,790.64
  4. Step 4: Simplify right side
    426,980.56x = 88,889,831,087.90
  5. Step 5: Solve for x
    x = 88,889,831,087.90/426,980.56
  6. Step 6: Final answer
    x = 208,182.38

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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.