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Finding the Fourth Proportional to 856.26, 1,285.65 and 491.76

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Solution

The fourth proportional to 856.26, 1,285.65 and 491.76 is: 738.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.26 : 1,285.65 = 491.76 : x
  2. Step 2: Convert to fraction form
    856.26/1,285.65 = 491.76/x
  3. Step 3: Cross multiply
    856.26x = 1,285.65 × 491.76
  4. Step 4: Simplify right side
    856.26x = 632,231.24
  5. Step 5: Solve for x
    x = 632,231.24/856.26
  6. Step 6: Final answer
    x = 738.36

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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.