Home / 212,918.76-319,463.34-86,568.72

Finding the Fourth Proportional to 212,918.76, 319,463.34 and 86,568.72

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Solution

The fourth proportional to 212,918.76, 319,463.34 and 86,568.72 is: 129,887.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,918.76 : 319,463.34 = 86,568.72 : x
  2. Step 2: Convert to fraction form
    212,918.76/319,463.34 = 86,568.72/x
  3. Step 3: Cross multiply
    212,918.76x = 319,463.34 × 86,568.72
  4. Step 4: Simplify right side
    212,918.76x = 27,655,531,395.05
  5. Step 5: Solve for x
    x = 27,655,531,395.05/212,918.76
  6. Step 6: Final answer
    x = 129,887.72

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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.