Home / 81,247.80-121,814.10-31,308.60

Finding the Fourth Proportional to 81,247.80, 121,814.10 and 31,308.60

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Solution

The fourth proportional to 81,247.80, 121,814.10 and 31,308.60 is: 46,940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,247.80 : 121,814.10 = 31,308.60 : x
  2. Step 2: Convert to fraction form
    81,247.80/121,814.10 = 31,308.60/x
  3. Step 3: Cross multiply
    81,247.80x = 121,814.10 × 31,308.60
  4. Step 4: Simplify right side
    81,247.80x = 3,813,828,931.26
  5. Step 5: Solve for x
    x = 3,813,828,931.26/81,247.80
  6. Step 6: Final answer
    x = 46,940.70

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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.