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Finding the Fourth Proportional to 863.19, 1,191.17 and 490.16

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Solution

The fourth proportional to 863.19, 1,191.17 and 490.16 is: 676.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.19 : 1,191.17 = 490.16 : x
  2. Step 2: Convert to fraction form
    863.19/1,191.17 = 490.16/x
  3. Step 3: Cross multiply
    863.19x = 1,191.17 × 490.16
  4. Step 4: Simplify right side
    863.19x = 583,868.09
  5. Step 5: Solve for x
    x = 583,868.09/863.19
  6. Step 6: Final answer
    x = 676.41

Related Problems

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Half scale
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Double scale
Find fourth proportional to 864.19, 1,192.55 and 491.16
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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.