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Finding the Fourth Proportional to 99,128, 136,779 and 56,107.28

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Solution

The fourth proportional to 99,128, 136,779 and 56,107.28 is: 77,418.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,128 : 136,779 = 56,107.28 : x
  2. Step 2: Convert to fraction form
    99,128/136,779 = 56,107.28/x
  3. Step 3: Cross multiply
    99,128x = 136,779 × 56,107.28
  4. Step 4: Simplify right side
    99,128x = 7,674,297,651.12
  5. Step 5: Solve for x
    x = 7,674,297,651.12/99,128
  6. Step 6: Final answer
    x = 77,418.06

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