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Finding the Fourth Proportional to 526,638.40, 788,645.40 and 421,662.40

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Solution

The fourth proportional to 526,638.40, 788,645.40 and 421,662.40 is: 631,442.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    526,638.40 : 788,645.40 = 421,662.40 : x
  2. Step 2: Convert to fraction form
    526,638.40/788,645.40 = 421,662.40/x
  3. Step 3: Cross multiply
    526,638.40x = 788,645.40 × 421,662.40
  4. Step 4: Simplify right side
    526,638.40x = 332,542,112,112.96
  5. Step 5: Solve for x
    x = 332,542,112,112.96/526,638.40
  6. Step 6: Final answer
    x = 631,442.96

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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.