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Finding the Fourth Proportional to 663.36, 916.20 and 545.64

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Solution

The fourth proportional to 663.36, 916.20 and 545.64 is: 753.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.36 : 916.20 = 545.64 : x
  2. Step 2: Convert to fraction form
    663.36/916.20 = 545.64/x
  3. Step 3: Cross multiply
    663.36x = 916.20 × 545.64
  4. Step 4: Simplify right side
    663.36x = 499,915.37
  5. Step 5: Solve for x
    x = 499,915.37/663.36
  6. Step 6: Final answer
    x = 753.61

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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.