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Finding the Fourth Proportional to 663.12, 915.12 and 427.14

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Solution

The fourth proportional to 663.12, 915.12 and 427.14 is: 589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.12 : 915.12 = 427.14 : x
  2. Step 2: Convert to fraction form
    663.12/915.12 = 427.14/x
  3. Step 3: Cross multiply
    663.12x = 915.12 × 427.14
  4. Step 4: Simplify right side
    663.12x = 390,884.36
  5. Step 5: Solve for x
    x = 390,884.36/663.12
  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.