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Finding the Fourth Proportional to 914.26, 1,261.70 and 521.29

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Solution

The fourth proportional to 914.26, 1,261.70 and 521.29 is: 719.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.26 : 1,261.70 = 521.29 : x
  2. Step 2: Convert to fraction form
    914.26/1,261.70 = 521.29/x
  3. Step 3: Cross multiply
    914.26x = 1,261.70 × 521.29
  4. Step 4: Simplify right side
    914.26x = 657,708.99
  5. Step 5: Solve for x
    x = 657,708.99/914.26
  6. Step 6: Final answer
    x = 719.39

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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.