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Finding the Fourth Proportional to 438,598.56, 657,979.84 and 138,998.70

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Solution

The fourth proportional to 438,598.56, 657,979.84 and 138,998.70 is: 208,524.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,598.56 : 657,979.84 = 138,998.70 : x
  2. Step 2: Convert to fraction form
    438,598.56/657,979.84 = 138,998.70/x
  3. Step 3: Cross multiply
    438,598.56x = 657,979.84 × 138,998.70
  4. Step 4: Simplify right side
    438,598.56x = 91,458,342,559.96
  5. Step 5: Solve for x
    x = 91,458,342,559.96/438,598.56
  6. Step 6: Final answer
    x = 208,524.04

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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.