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Finding the Fourth Proportional to 666,015.31, 998,856.64 and 261,290

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Solution

The fourth proportional to 666,015.31, 998,856.64 and 261,290 is: 391,869.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,015.31 : 998,856.64 = 261,290 : x
  2. Step 2: Convert to fraction form
    666,015.31/998,856.64 = 261,290/x
  3. Step 3: Cross multiply
    666,015.31x = 998,856.64 × 261,290
  4. Step 4: Simplify right side
    666,015.31x = 260,991,251,465.60
  5. Step 5: Solve for x
    x = 260,991,251,465.60/666,015.31
  6. Step 6: Final answer
    x = 391,869.75

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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.