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Finding the Third Proportional to 515 and 841.50

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Solution

The third proportional to 515 and 841.50 is: 1,374.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 841.50 = 841.50 : x
  2. Step 2: Convert to fraction form
    515/841.50 = 841.50/x
  3. Step 3: Cross multiply
    515x = 841.50 × 841.50
  4. Step 4: Simplify right side
    515x = 708,122.25
  5. Step 5: Solve for x
    x = 708,122.25/515
  6. Step 6: Final answer
    x = 1,374.99

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.