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Finding the Fourth Proportional to 390,915.43, 586,751.39 and 188,653.92

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Solution

The fourth proportional to 390,915.43, 586,751.39 and 188,653.92 is: 283,163.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,915.43 : 586,751.39 = 188,653.92 : x
  2. Step 2: Convert to fraction form
    390,915.43/586,751.39 = 188,653.92/x
  3. Step 3: Cross multiply
    390,915.43x = 586,751.39 × 188,653.92
  4. Step 4: Simplify right side
    390,915.43x = 110,692,948,738.00
  5. Step 5: Solve for x
    x = 110,692,948,738.00/390,915.43
  6. Step 6: Final answer
    x = 283,163.42

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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.