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Finding the Fourth Proportional to 665,886.50, 999,081.25 and 399,831.87

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Solution

The fourth proportional to 665,886.50, 999,081.25 and 399,831.87 is: 599,898.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,886.50 : 999,081.25 = 399,831.87 : x
  2. Step 2: Convert to fraction form
    665,886.50/999,081.25 = 399,831.87/x
  3. Step 3: Cross multiply
    665,886.50x = 999,081.25 × 399,831.87
  4. Step 4: Simplify right side
    665,886.50x = 399,464,522,470.28
  5. Step 5: Solve for x
    x = 399,464,522,470.28/665,886.50
  6. Step 6: Final answer
    x = 599,898.82

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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.