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Finding the Fourth Proportional to 914.27, 1,261.79 and 521.42

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Solution

The fourth proportional to 914.27, 1,261.79 and 521.42 is: 719.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.27 : 1,261.79 = 521.42 : x
  2. Step 2: Convert to fraction form
    914.27/1,261.79 = 521.42/x
  3. Step 3: Cross multiply
    914.27x = 1,261.79 × 521.42
  4. Step 4: Simplify right side
    914.27x = 657,913.63
  5. Step 5: Solve for x
    x = 657,913.63/914.27
  6. Step 6: Final answer
    x = 719.61

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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.