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Finding the Fourth Proportional to 645.16, 891.46 and 515.24

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Solution

The fourth proportional to 645.16, 891.46 and 515.24 is: 711.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.16 : 891.46 = 515.24 : x
  2. Step 2: Convert to fraction form
    645.16/891.46 = 515.24/x
  3. Step 3: Cross multiply
    645.16x = 891.46 × 515.24
  4. Step 4: Simplify right side
    645.16x = 459,315.85
  5. Step 5: Solve for x
    x = 459,315.85/645.16
  6. Step 6: Final answer
    x = 711.94

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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.