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Finding the Fourth Proportional to 70,968.86, 106,435.12 and 21,037.28

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Solution

The fourth proportional to 70,968.86, 106,435.12 and 21,037.28 is: 31,550.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,968.86 : 106,435.12 = 21,037.28 : x
  2. Step 2: Convert to fraction form
    70,968.86/106,435.12 = 21,037.28/x
  3. Step 3: Cross multiply
    70,968.86x = 106,435.12 × 21,037.28
  4. Step 4: Simplify right side
    70,968.86x = 2,239,105,421.27
  5. Step 5: Solve for x
    x = 2,239,105,421.27/70,968.86
  6. Step 6: Final answer
    x = 31,550.54

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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.