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Finding the Fourth Proportional to 663.66, 915.72 and 427.55

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Solution

The fourth proportional to 663.66, 915.72 and 427.55 is: 589.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.66 : 915.72 = 427.55 : x
  2. Step 2: Convert to fraction form
    663.66/915.72 = 427.55/x
  3. Step 3: Cross multiply
    663.66x = 915.72 × 427.55
  4. Step 4: Simplify right side
    663.66x = 391,518.23
  5. Step 5: Solve for x
    x = 391,518.23/663.66
  6. Step 6: Final answer
    x = 589.94

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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.