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Finding the Fourth Proportional to 611,318.99, 915,685.72 and 386,563.43

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Solution

The fourth proportional to 611,318.99, 915,685.72 and 386,563.43 is: 579,027.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,318.99 : 915,685.72 = 386,563.43 : x
  2. Step 2: Convert to fraction form
    611,318.99/915,685.72 = 386,563.43/x
  3. Step 3: Cross multiply
    611,318.99x = 915,685.72 × 386,563.43
  4. Step 4: Simplify right side
    611,318.99x = 353,970,612,725.22
  5. Step 5: Solve for x
    x = 353,970,612,725.22/611,318.99
  6. Step 6: Final answer
    x = 579,027.67

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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.