Home / 81,319.30-121,908.84-31,434.40

Finding the Fourth Proportional to 81,319.30, 121,908.84 and 31,434.40

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Solution

The fourth proportional to 81,319.30, 121,908.84 and 31,434.40 is: 47,124.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,319.30 : 121,908.84 = 31,434.40 : x
  2. Step 2: Convert to fraction form
    81,319.30/121,908.84 = 31,434.40/x
  3. Step 3: Cross multiply
    81,319.30x = 121,908.84 × 31,434.40
  4. Step 4: Simplify right side
    81,319.30x = 3,832,131,240.10
  5. Step 5: Solve for x
    x = 3,832,131,240.10/81,319.30
  6. Step 6: Final answer
    x = 47,124.50

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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.