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Finding the Fourth Proportional to 70,346.95, 105,525.89 and 20,427.87

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Solution

The fourth proportional to 70,346.95, 105,525.89 and 20,427.87 is: 30,643.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,346.95 : 105,525.89 = 20,427.87 : x
  2. Step 2: Convert to fraction form
    70,346.95/105,525.89 = 20,427.87/x
  3. Step 3: Cross multiply
    70,346.95x = 105,525.89 × 20,427.87
  4. Step 4: Simplify right side
    70,346.95x = 2,155,669,162.55
  5. Step 5: Solve for x
    x = 2,155,669,162.55/70,346.95
  6. Step 6: Final answer
    x = 30,643.39

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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.