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Finding the Fourth Proportional to 613.99, 915.14 and 579.40

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Solution

The fourth proportional to 613.99, 915.14 and 579.40 is: 863.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.99 : 915.14 = 579.40 : x
  2. Step 2: Convert to fraction form
    613.99/915.14 = 579.40/x
  3. Step 3: Cross multiply
    613.99x = 915.14 × 579.40
  4. Step 4: Simplify right side
    613.99x = 530,229.22
  5. Step 5: Solve for x
    x = 530,229.22/613.99
  6. Step 6: Final answer
    x = 863.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.