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Finding the Fourth Proportional to 666.64, 916.88 and 535.44

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Solution

The fourth proportional to 666.64, 916.88 and 535.44 is: 736.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.64 : 916.88 = 535.44 : x
  2. Step 2: Convert to fraction form
    666.64/916.88 = 535.44/x
  3. Step 3: Cross multiply
    666.64x = 916.88 × 535.44
  4. Step 4: Simplify right side
    666.64x = 490,934.23
  5. Step 5: Solve for x
    x = 490,934.23/666.64
  6. Step 6: Final answer
    x = 736.43

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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.