Home / 81,272.16-121,908.24-39,690

Finding the Fourth Proportional to 81,272.16, 121,908.24 and 39,690

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Solution

The fourth proportional to 81,272.16, 121,908.24 and 39,690 is: 59,535

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,272.16 : 121,908.24 = 39,690 : x
  2. Step 2: Convert to fraction form
    81,272.16/121,908.24 = 39,690/x
  3. Step 3: Cross multiply
    81,272.16x = 121,908.24 × 39,690
  4. Step 4: Simplify right side
    81,272.16x = 4,838,538,045.60
  5. Step 5: Solve for x
    x = 4,838,538,045.60/81,272.16
  6. Step 6: Final answer
    x = 59,535

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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.