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Finding the Fourth Proportional to 70,560.95, 105,830.48 and 20,629.31

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Solution

The fourth proportional to 70,560.95, 105,830.48 and 20,629.31 is: 30,940.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,560.95 : 105,830.48 = 20,629.31 : x
  2. Step 2: Convert to fraction form
    70,560.95/105,830.48 = 20,629.31/x
  3. Step 3: Cross multiply
    70,560.95x = 105,830.48 × 20,629.31
  4. Step 4: Simplify right side
    70,560.95x = 2,183,209,779.37
  5. Step 5: Solve for x
    x = 2,183,209,779.37/70,560.95
  6. Step 6: Final answer
    x = 30,940.77

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1.5x scale

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.