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Finding the Fourth Proportional to 260,485.56, 390,736.30 and 89,705.42

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Solution

The fourth proportional to 260,485.56, 390,736.30 and 89,705.42 is: 134,560.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,485.56 : 390,736.30 = 89,705.42 : x
  2. Step 2: Convert to fraction form
    260,485.56/390,736.30 = 89,705.42/x
  3. Step 3: Cross multiply
    260,485.56x = 390,736.30 × 89,705.42
  4. Step 4: Simplify right side
    260,485.56x = 35,051,163,900.75
  5. Step 5: Solve for x
    x = 35,051,163,900.75/260,485.56
  6. Step 6: Final answer
    x = 134,560.87

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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.