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Finding the Fourth Proportional to 863.19, 1,191.21 and 509.12

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Solution

The fourth proportional to 863.19, 1,191.21 and 509.12 is: 702.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.19 : 1,191.21 = 509.12 : x
  2. Step 2: Convert to fraction form
    863.19/1,191.21 = 509.12/x
  3. Step 3: Cross multiply
    863.19x = 1,191.21 × 509.12
  4. Step 4: Simplify right side
    863.19x = 606,468.84
  5. Step 5: Solve for x
    x = 606,468.84/863.19
  6. Step 6: Final answer
    x = 702.59

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Double scale
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1.5x scale

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.