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Finding the Third Proportional to 128,607.75 and 272,767.50

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Solution

The third proportional to 128,607.75 and 272,767.50 is: 578,519.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,607.75 : 272,767.50 = 272,767.50 : x
  2. Step 2: Convert to fraction form
    128,607.75/272,767.50 = 272,767.50/x
  3. Step 3: Cross multiply
    128,607.75x = 272,767.50 × 272,767.50
  4. Step 4: Simplify right side
    128,607.75x = 74,402,109,056.25
  5. Step 5: Solve for x
    x = 74,402,109,056.25/128,607.75
  6. Step 6: Final answer
    x = 578,519.64

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.