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Finding the Fourth Proportional to 856.52, 1,285.39 and 394.01

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Solution

The fourth proportional to 856.52, 1,285.39 and 394.01 is: 591.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.52 : 1,285.39 = 394.01 : x
  2. Step 2: Convert to fraction form
    856.52/1,285.39 = 394.01/x
  3. Step 3: Cross multiply
    856.52x = 1,285.39 × 394.01
  4. Step 4: Simplify right side
    856.52x = 506,455.40
  5. Step 5: Solve for x
    x = 506,455.40/856.52
  6. Step 6: Final answer
    x = 591.30

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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.