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Finding the Fourth Proportional to 1,688.62, 2,532.80 and 518.62

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Solution

The fourth proportional to 1,688.62, 2,532.80 and 518.62 is: 777.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.62 : 2,532.80 = 518.62 : x
  2. Step 2: Convert to fraction form
    1,688.62/2,532.80 = 518.62/x
  3. Step 3: Cross multiply
    1,688.62x = 2,532.80 × 518.62
  4. Step 4: Simplify right side
    1,688.62x = 1,313,560.74
  5. Step 5: Solve for x
    x = 1,313,560.74/1,688.62
  6. Step 6: Final answer
    x = 777.89

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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.