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Finding the Fourth Proportional to 914.18, 1,261.57 and 521.21

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Solution

The fourth proportional to 914.18, 1,261.57 and 521.21 is: 719.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.18 : 1,261.57 = 521.21 : x
  2. Step 2: Convert to fraction form
    914.18/1,261.57 = 521.21/x
  3. Step 3: Cross multiply
    914.18x = 1,261.57 × 521.21
  4. Step 4: Simplify right side
    914.18x = 657,544.75
  5. Step 5: Solve for x
    x = 657,544.75/914.18
  6. Step 6: Final answer
    x = 719.27

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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.