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Finding the Fourth Proportional to 613.08, 918 and 515.34

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Solution

The fourth proportional to 613.08, 918 and 515.34 is: 771.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.08 : 918 = 515.34 : x
  2. Step 2: Convert to fraction form
    613.08/918 = 515.34/x
  3. Step 3: Cross multiply
    613.08x = 918 × 515.34
  4. Step 4: Simplify right side
    613.08x = 473,082.12
  5. Step 5: Solve for x
    x = 473,082.12/613.08
  6. Step 6: Final answer
    x = 771.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.