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Finding the Fourth Proportional to 856.40, 1,181.84 and 659.56

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Solution

The fourth proportional to 856.40, 1,181.84 and 659.56 is: 910.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.40 : 1,181.84 = 659.56 : x
  2. Step 2: Convert to fraction form
    856.40/1,181.84 = 659.56/x
  3. Step 3: Cross multiply
    856.40x = 1,181.84 × 659.56
  4. Step 4: Simplify right side
    856.40x = 779,494.39
  5. Step 5: Solve for x
    x = 779,494.39/856.40
  6. Step 6: Final answer
    x = 910.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.