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Finding the Fourth Proportional to 207,289.28, 310,953.36 and 82,640

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Solution

The fourth proportional to 207,289.28, 310,953.36 and 82,640 is: 123,967.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,289.28 : 310,953.36 = 82,640 : x
  2. Step 2: Convert to fraction form
    207,289.28/310,953.36 = 82,640/x
  3. Step 3: Cross multiply
    207,289.28x = 310,953.36 × 82,640
  4. Step 4: Simplify right side
    207,289.28x = 25,697,185,670.40
  5. Step 5: Solve for x
    x = 25,697,185,670.40/207,289.28
  6. Step 6: Final answer
    x = 123,967.75

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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.