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Finding the Fourth Proportional to 391,688, 587,530.56 and 111,205.28

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Solution

The fourth proportional to 391,688, 587,530.56 and 111,205.28 is: 166,807.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,688 : 587,530.56 = 111,205.28 : x
  2. Step 2: Convert to fraction form
    391,688/587,530.56 = 111,205.28/x
  3. Step 3: Cross multiply
    391,688x = 587,530.56 × 111,205.28
  4. Step 4: Simplify right side
    391,688x = 65,336,500,433.36
  5. Step 5: Solve for x
    x = 65,336,500,433.36/391,688
  6. Step 6: Final answer
    x = 166,807.51

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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.