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Finding the Fourth Proportional to 645,247.81, 890,395.69 and 354,879.51

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Solution

The fourth proportional to 645,247.81, 890,395.69 and 354,879.51 is: 489,708.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,247.81 : 890,395.69 = 354,879.51 : x
  2. Step 2: Convert to fraction form
    645,247.81/890,395.69 = 354,879.51/x
  3. Step 3: Cross multiply
    645,247.81x = 890,395.69 × 354,879.51
  4. Step 4: Simplify right side
    645,247.81x = 315,983,187,621.00
  5. Step 5: Solve for x
    x = 315,983,187,621.00/645,247.81
  6. Step 6: Final answer
    x = 489,708.27

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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.