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Finding the Fourth Proportional to 260,710.67, 390,910.69 and 80,742.78

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Solution

The fourth proportional to 260,710.67, 390,910.69 and 80,742.78 is: 121,066.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,710.67 : 390,910.69 = 80,742.78 : x
  2. Step 2: Convert to fraction form
    260,710.67/390,910.69 = 80,742.78/x
  3. Step 3: Cross multiply
    260,710.67x = 390,910.69 × 80,742.78
  4. Step 4: Simplify right side
    260,710.67x = 31,563,215,842.32
  5. Step 5: Solve for x
    x = 31,563,215,842.32/260,710.67
  6. Step 6: Final answer
    x = 121,066.07

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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.