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Finding the Fourth Proportional to 856.13, 1,181.45 and 463.15

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Solution

The fourth proportional to 856.13, 1,181.45 and 463.15 is: 639.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.13 : 1,181.45 = 463.15 : x
  2. Step 2: Convert to fraction form
    856.13/1,181.45 = 463.15/x
  3. Step 3: Cross multiply
    856.13x = 1,181.45 × 463.15
  4. Step 4: Simplify right side
    856.13x = 547,191.20
  5. Step 5: Solve for x
    x = 547,191.20/856.13
  6. Step 6: Final answer
    x = 639.15

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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.