Home / 81,280.69-121,931.42-31,375.06

Finding the Fourth Proportional to 81,280.69, 121,931.42 and 31,375.06

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Solution

The fourth proportional to 81,280.69, 121,931.42 and 31,375.06 is: 47,066.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,280.69 : 121,931.42 = 31,375.06 : x
  2. Step 2: Convert to fraction form
    81,280.69/121,931.42 = 31,375.06/x
  3. Step 3: Cross multiply
    81,280.69x = 121,931.42 × 31,375.06
  4. Step 4: Simplify right side
    81,280.69x = 3,825,605,482.57
  5. Step 5: Solve for x
    x = 3,825,605,482.57/81,280.69
  6. Step 6: Final answer
    x = 47,066.60

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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.