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Finding the Fourth Proportional to 716.19, 988 and 421.26

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Solution

The fourth proportional to 716.19, 988 and 421.26 is: 581.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.19 : 988 = 421.26 : x
  2. Step 2: Convert to fraction form
    716.19/988 = 421.26/x
  3. Step 3: Cross multiply
    716.19x = 988 × 421.26
  4. Step 4: Simplify right side
    716.19x = 416,204.88
  5. Step 5: Solve for x
    x = 416,204.88/716.19
  6. Step 6: Final answer
    x = 581.14

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Double scale
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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.