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Finding the Fourth Proportional to 71,720.99, 107,483.08 and 45,378.58

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Solution

The fourth proportional to 71,720.99, 107,483.08 and 45,378.58 is: 68,005.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.99 : 107,483.08 = 45,378.58 : x
  2. Step 2: Convert to fraction form
    71,720.99/107,483.08 = 45,378.58/x
  3. Step 3: Cross multiply
    71,720.99x = 107,483.08 × 45,378.58
  4. Step 4: Simplify right side
    71,720.99x = 4,877,429,321.26
  5. Step 5: Solve for x
    x = 4,877,429,321.26/71,720.99
  6. Step 6: Final answer
    x = 68,005.60

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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.