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Finding the Fourth Proportional to 856.19, 1,283.48 and 394.34

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Solution

The fourth proportional to 856.19, 1,283.48 and 394.34 is: 591.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.19 : 1,283.48 = 394.34 : x
  2. Step 2: Convert to fraction form
    856.19/1,283.48 = 394.34/x
  3. Step 3: Cross multiply
    856.19x = 1,283.48 × 394.34
  4. Step 4: Simplify right side
    856.19x = 506,122.07
  5. Step 5: Solve for x
    x = 506,122.07/856.19
  6. Step 6: Final answer
    x = 591.14

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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.