Home / 81,289.04-121,938.96-31,369.76

Finding the Fourth Proportional to 81,289.04, 121,938.96 and 31,369.76

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Solution

The fourth proportional to 81,289.04, 121,938.96 and 31,369.76 is: 47,056.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,289.04 : 121,938.96 = 31,369.76 : x
  2. Step 2: Convert to fraction form
    81,289.04/121,938.96 = 31,369.76/x
  3. Step 3: Cross multiply
    81,289.04x = 121,938.96 × 31,369.76
  4. Step 4: Simplify right side
    81,289.04x = 3,825,195,909.85
  5. Step 5: Solve for x
    x = 3,825,195,909.85/81,289.04
  6. Step 6: Final answer
    x = 47,056.72

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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.