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Finding the Fourth Proportional to 486,305.40, 728,939.70 and 186,670.20

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Solution

The fourth proportional to 486,305.40, 728,939.70 and 186,670.20 is: 279,806.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,305.40 : 728,939.70 = 186,670.20 : x
  2. Step 2: Convert to fraction form
    486,305.40/728,939.70 = 186,670.20/x
  3. Step 3: Cross multiply
    486,305.40x = 728,939.70 × 186,670.20
  4. Step 4: Simplify right side
    486,305.40x = 136,071,319,586.94
  5. Step 5: Solve for x
    x = 136,071,319,586.94/486,305.40
  6. Step 6: Final answer
    x = 279,806.31

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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.