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Finding the Fourth Proportional to 81,354.90, 112,190.90 and 63,443.37

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Solution

The fourth proportional to 81,354.90, 112,190.90 and 63,443.37 is: 87,490.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,354.90 : 112,190.90 = 63,443.37 : x
  2. Step 2: Convert to fraction form
    81,354.90/112,190.90 = 63,443.37/x
  3. Step 3: Cross multiply
    81,354.90x = 112,190.90 × 63,443.37
  4. Step 4: Simplify right side
    81,354.90x = 7,117,768,779.33
  5. Step 5: Solve for x
    x = 7,117,768,779.33/81,354.90
  6. Step 6: Final answer
    x = 87,490.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.