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Finding the Fourth Proportional to 492,431.50, 679,607.79 and 288,653.70

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Solution

The fourth proportional to 492,431.50, 679,607.79 and 288,653.70 is: 398,372.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,431.50 : 679,607.79 = 288,653.70 : x
  2. Step 2: Convert to fraction form
    492,431.50/679,607.79 = 288,653.70/x
  3. Step 3: Cross multiply
    492,431.50x = 679,607.79 × 288,653.70
  4. Step 4: Simplify right side
    492,431.50x = 196,171,299,734.28
  5. Step 5: Solve for x
    x = 196,171,299,734.28/492,431.50
  6. Step 6: Final answer
    x = 398,372.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.