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Finding the Fourth Proportional to 663.09, 914.64 and 427.34

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Solution

The fourth proportional to 663.09, 914.64 and 427.34 is: 589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.09 : 914.64 = 427.34 : x
  2. Step 2: Convert to fraction form
    663.09/914.64 = 427.34/x
  3. Step 3: Cross multiply
    663.09x = 914.64 × 427.34
  4. Step 4: Simplify right side
    663.09x = 390,862.26
  5. Step 5: Solve for x
    x = 390,862.26/663.09
  6. Step 6: Final answer
    x = 589.46

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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.