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Finding the Fourth Proportional to 70,281, 105,421.60 and 28,728

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Solution

The fourth proportional to 70,281, 105,421.60 and 28,728 is: 43,092.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,281 : 105,421.60 = 28,728 : x
  2. Step 2: Convert to fraction form
    70,281/105,421.60 = 28,728/x
  3. Step 3: Cross multiply
    70,281x = 105,421.60 × 28,728
  4. Step 4: Simplify right side
    70,281x = 3,028,551,760.71
  5. Step 5: Solve for x
    x = 3,028,551,760.71/70,281
  6. Step 6: Final answer
    x = 43,092.04

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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.