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Finding the Fourth Proportional to 1,056.82, 1,585.12 and 326.40

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Solution

The fourth proportional to 1,056.82, 1,585.12 and 326.40 is: 489.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.82 : 1,585.12 = 326.40 : x
  2. Step 2: Convert to fraction form
    1,056.82/1,585.12 = 326.40/x
  3. Step 3: Cross multiply
    1,056.82x = 1,585.12 × 326.40
  4. Step 4: Simplify right side
    1,056.82x = 517,383.17
  5. Step 5: Solve for x
    x = 517,383.17/1,056.82
  6. Step 6: Final answer
    x = 489.57

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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.