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Finding the Fourth Proportional to 70,811.55, 106,216.29 and 28,691.28

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Solution

The fourth proportional to 70,811.55, 106,216.29 and 28,691.28 is: 43,036.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,811.55 : 106,216.29 = 28,691.28 : x
  2. Step 2: Convert to fraction form
    70,811.55/106,216.29 = 28,691.28/x
  3. Step 3: Cross multiply
    70,811.55x = 106,216.29 × 28,691.28
  4. Step 4: Simplify right side
    70,811.55x = 3,047,481,316.95
  5. Step 5: Solve for x
    x = 3,047,481,316.95/70,811.55
  6. Step 6: Final answer
    x = 43,036.50

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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.