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Finding the Fourth Proportional to 856.13, 1,283.07 and 393.83

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Solution

The fourth proportional to 856.13, 1,283.07 and 393.83 is: 590.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.13 : 1,283.07 = 393.83 : x
  2. Step 2: Convert to fraction form
    856.13/1,283.07 = 393.83/x
  3. Step 3: Cross multiply
    856.13x = 1,283.07 × 393.83
  4. Step 4: Simplify right side
    856.13x = 505,311.46
  5. Step 5: Solve for x
    x = 505,311.46/856.13
  6. Step 6: Final answer
    x = 590.23

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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.