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Finding the Fourth Proportional to 72,479.40, 108,719.10 and 45,907.35

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Solution

The fourth proportional to 72,479.40, 108,719.10 and 45,907.35 is: 68,861.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,479.40 : 108,719.10 = 45,907.35 : x
  2. Step 2: Convert to fraction form
    72,479.40/108,719.10 = 45,907.35/x
  3. Step 3: Cross multiply
    72,479.40x = 108,719.10 × 45,907.35
  4. Step 4: Simplify right side
    72,479.40x = 4,991,005,775.39
  5. Step 5: Solve for x
    x = 4,991,005,775.39/72,479.40
  6. Step 6: Final answer
    x = 68,861.03

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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.