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Finding the Fourth Proportional to 856.72, 1,182.72 and 669.79

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Solution

The fourth proportional to 856.72, 1,182.72 and 669.79 is: 924.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.72 : 1,182.72 = 669.79 : x
  2. Step 2: Convert to fraction form
    856.72/1,182.72 = 669.79/x
  3. Step 3: Cross multiply
    856.72x = 1,182.72 × 669.79
  4. Step 4: Simplify right side
    856.72x = 792,174.03
  5. Step 5: Solve for x
    x = 792,174.03/856.72
  6. Step 6: Final answer
    x = 924.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.