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Finding the Fourth Proportional to 492,617.79, 679,820.09 and 288,619.89

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Solution

The fourth proportional to 492,617.79, 679,820.09 and 288,619.89 is: 398,299.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,617.79 : 679,820.09 = 288,619.89 : x
  2. Step 2: Convert to fraction form
    492,617.79/679,820.09 = 288,619.89/x
  3. Step 3: Cross multiply
    492,617.79x = 679,820.09 × 288,619.89
  4. Step 4: Simplify right side
    492,617.79x = 196,209,598,152.49
  5. Step 5: Solve for x
    x = 196,209,598,152.49/492,617.79
  6. Step 6: Final answer
    x = 398,299.86

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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.