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Finding the Fourth Proportional to 856.78, 1,181.17 and 657.52

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Solution

The fourth proportional to 856.78, 1,181.17 and 657.52 is: 906.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.78 : 1,181.17 = 657.52 : x
  2. Step 2: Convert to fraction form
    856.78/1,181.17 = 657.52/x
  3. Step 3: Cross multiply
    856.78x = 1,181.17 × 657.52
  4. Step 4: Simplify right side
    856.78x = 776,642.90
  5. Step 5: Solve for x
    x = 776,642.90/856.78
  6. Step 6: Final answer
    x = 906.47

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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.