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Finding the Fourth Proportional to 212,960.18, 319,419.01 and 86,607.88

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Solution

The fourth proportional to 212,960.18, 319,419.01 and 86,607.88 is: 129,903.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,960.18 : 319,419.01 = 86,607.88 : x
  2. Step 2: Convert to fraction form
    212,960.18/319,419.01 = 86,607.88/x
  3. Step 3: Cross multiply
    212,960.18x = 319,419.01 × 86,607.88
  4. Step 4: Simplify right side
    212,960.18x = 27,664,203,287.80
  5. Step 5: Solve for x
    x = 27,664,203,287.80/212,960.18
  6. Step 6: Final answer
    x = 129,903.17

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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.