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Finding the Fourth Proportional to 664.80, 915.72 and 559.76

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Solution

The fourth proportional to 664.80, 915.72 and 559.76 is: 771.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.80 : 915.72 = 559.76 : x
  2. Step 2: Convert to fraction form
    664.80/915.72 = 559.76/x
  3. Step 3: Cross multiply
    664.80x = 915.72 × 559.76
  4. Step 4: Simplify right side
    664.80x = 512,583.43
  5. Step 5: Solve for x
    x = 512,583.43/664.80
  6. Step 6: Final answer
    x = 771.03

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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.