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Finding the Fourth Proportional to 212,908.59, 319,362.93 and 86,617.56

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Solution

The fourth proportional to 212,908.59, 319,362.93 and 86,617.56 is: 129,926.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,908.59 : 319,362.93 = 86,617.56 : x
  2. Step 2: Convert to fraction form
    212,908.59/319,362.93 = 86,617.56/x
  3. Step 3: Cross multiply
    212,908.59x = 319,362.93 × 86,617.56
  4. Step 4: Simplify right side
    212,908.59x = 27,662,437,751.05
  5. Step 5: Solve for x
    x = 27,662,437,751.05/212,908.59
  6. Step 6: Final answer
    x = 129,926.36

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1.5x scale

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.