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Finding the Fourth Proportional to 812.52, 1,215.59 and 515.01

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Solution

The fourth proportional to 812.52, 1,215.59 and 515.01 is: 770.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.52 : 1,215.59 = 515.01 : x
  2. Step 2: Convert to fraction form
    812.52/1,215.59 = 515.01/x
  3. Step 3: Cross multiply
    812.52x = 1,215.59 × 515.01
  4. Step 4: Simplify right side
    812.52x = 626,038.43
  5. Step 5: Solve for x
    x = 626,038.43/812.52
  6. Step 6: Final answer
    x = 770.49

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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.