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Finding the Third Proportional to 315,855.50 and 515,709

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Solution

The third proportional to 315,855.50 and 515,709 is: 842,017.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,855.50 : 515,709 = 515,709 : x
  2. Step 2: Convert to fraction form
    315,855.50/515,709 = 515,709/x
  3. Step 3: Cross multiply
    315,855.50x = 515,709 × 515,709
  4. Step 4: Simplify right side
    315,855.50x = 265,955,772,681
  5. Step 5: Solve for x
    x = 265,955,772,681/315,855.50
  6. Step 6: Final answer
    x = 842,017.23

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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.