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Finding the Fourth Proportional to 81,390.84, 112,387.83 and 61,212.57

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Solution

The fourth proportional to 81,390.84, 112,387.83 and 61,212.57 is: 84,524.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.84 : 112,387.83 = 61,212.57 : x
  2. Step 2: Convert to fraction form
    81,390.84/112,387.83 = 61,212.57/x
  3. Step 3: Cross multiply
    81,390.84x = 112,387.83 × 61,212.57
  4. Step 4: Simplify right side
    81,390.84x = 6,879,547,911.02
  5. Step 5: Solve for x
    x = 6,879,547,911.02/81,390.84
  6. Step 6: Final answer
    x = 84,524.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.