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Finding the Fourth Proportional to 385,364.20, 579,428.70 and 324,538.60

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Solution

The fourth proportional to 385,364.20, 579,428.70 and 324,538.60 is: 487,972.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,364.20 : 579,428.70 = 324,538.60 : x
  2. Step 2: Convert to fraction form
    385,364.20/579,428.70 = 324,538.60/x
  3. Step 3: Cross multiply
    385,364.20x = 579,428.70 × 324,538.60
  4. Step 4: Simplify right side
    385,364.20x = 188,046,979,097.82
  5. Step 5: Solve for x
    x = 188,046,979,097.82/385,364.20
  6. Step 6: Final answer
    x = 487,972.10

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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.