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Finding the Fourth Proportional to 856.43, 1,285.34 and 486.47

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Solution

The fourth proportional to 856.43, 1,285.34 and 486.47 is: 730.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.43 : 1,285.34 = 486.47 : x
  2. Step 2: Convert to fraction form
    856.43/1,285.34 = 486.47/x
  3. Step 3: Cross multiply
    856.43x = 1,285.34 × 486.47
  4. Step 4: Simplify right side
    856.43x = 625,279.35
  5. Step 5: Solve for x
    x = 625,279.35/856.43
  6. Step 6: Final answer
    x = 730.10

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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.