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Finding the Fourth Proportional to 66,938.94, 100,359.18 and 31,903.20

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Solution

The fourth proportional to 66,938.94, 100,359.18 and 31,903.20 is: 47,831.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,938.94 : 100,359.18 = 31,903.20 : x
  2. Step 2: Convert to fraction form
    66,938.94/100,359.18 = 31,903.20/x
  3. Step 3: Cross multiply
    66,938.94x = 100,359.18 × 31,903.20
  4. Step 4: Simplify right side
    66,938.94x = 3,201,778,991.38
  5. Step 5: Solve for x
    x = 3,201,778,991.38/66,938.94
  6. Step 6: Final answer
    x = 47,831.34

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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.