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Finding the Fourth Proportional to 492,638.54, 679,848.76 and 288,640.64

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Solution

The fourth proportional to 492,638.54, 679,848.76 and 288,640.64 is: 398,328.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,638.54 : 679,848.76 = 288,640.64 : x
  2. Step 2: Convert to fraction form
    492,638.54/679,848.76 = 288,640.64/x
  3. Step 3: Cross multiply
    492,638.54x = 679,848.76 × 288,640.64
  4. Step 4: Simplify right side
    492,638.54x = 196,231,981,189.61
  5. Step 5: Solve for x
    x = 196,231,981,189.61/492,638.54
  6. Step 6: Final answer
    x = 398,328.52

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1.5x scale

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.