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Finding the Fourth Proportional to 663.74, 916.54 and 415.48

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Solution

The fourth proportional to 663.74, 916.54 and 415.48 is: 573.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.74 : 916.54 = 415.48 : x
  2. Step 2: Convert to fraction form
    663.74/916.54 = 415.48/x
  3. Step 3: Cross multiply
    663.74x = 916.54 × 415.48
  4. Step 4: Simplify right side
    663.74x = 380,800.71
  5. Step 5: Solve for x
    x = 380,800.71/663.74
  6. Step 6: Final answer
    x = 573.72

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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.