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Finding the Fourth Proportional to 1,208.58, 1,812.93 and 515.31

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Solution

The fourth proportional to 1,208.58, 1,812.93 and 515.31 is: 772.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.58 : 1,812.93 = 515.31 : x
  2. Step 2: Convert to fraction form
    1,208.58/1,812.93 = 515.31/x
  3. Step 3: Cross multiply
    1,208.58x = 1,812.93 × 515.31
  4. Step 4: Simplify right side
    1,208.58x = 934,220.96
  5. Step 5: Solve for x
    x = 934,220.96/1,208.58
  6. Step 6: Final answer
    x = 772.99

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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.