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Finding the Fourth Proportional to 81,409.80, 121,904.39 and 56,187.17

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Solution

The fourth proportional to 81,409.80, 121,904.39 and 56,187.17 is: 84,135.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,409.80 : 121,904.39 = 56,187.17 : x
  2. Step 2: Convert to fraction form
    81,409.80/121,904.39 = 56,187.17/x
  3. Step 3: Cross multiply
    81,409.80x = 121,904.39 × 56,187.17
  4. Step 4: Simplify right side
    81,409.80x = 6,849,462,004.92
  5. Step 5: Solve for x
    x = 6,849,462,004.92/81,409.80
  6. Step 6: Final answer
    x = 84,135.60

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1.5x scale

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.