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Finding the Fourth Proportional to 663.66, 916.58 and 443.61

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Solution

The fourth proportional to 663.66, 916.58 and 443.61 is: 612.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.66 : 916.58 = 443.61 : x
  2. Step 2: Convert to fraction form
    663.66/916.58 = 443.61/x
  3. Step 3: Cross multiply
    663.66x = 916.58 × 443.61
  4. Step 4: Simplify right side
    663.66x = 406,605.16
  5. Step 5: Solve for x
    x = 406,605.16/663.66
  6. Step 6: Final answer
    x = 612.67

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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.