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Finding the Fourth Proportional to 71,981.80, 107,778.30 and 56,429.80

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Solution

The fourth proportional to 71,981.80, 107,778.30 and 56,429.80 is: 84,492.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,981.80 : 107,778.30 = 56,429.80 : x
  2. Step 2: Convert to fraction form
    71,981.80/107,778.30 = 56,429.80/x
  3. Step 3: Cross multiply
    71,981.80x = 107,778.30 × 56,429.80
  4. Step 4: Simplify right side
    71,981.80x = 6,081,907,913.34
  5. Step 5: Solve for x
    x = 6,081,907,913.34/71,981.80
  6. Step 6: Final answer
    x = 84,492.30

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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.