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Finding the Fourth Proportional to 72,364.78, 108,530.16 and 40,788.55

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Solution

The fourth proportional to 72,364.78, 108,530.16 and 40,788.55 is: 61,173.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,364.78 : 108,530.16 = 40,788.55 : x
  2. Step 2: Convert to fraction form
    72,364.78/108,530.16 = 40,788.55/x
  3. Step 3: Cross multiply
    72,364.78x = 108,530.16 × 40,788.55
  4. Step 4: Simplify right side
    72,364.78x = 4,426,787,857.67
  5. Step 5: Solve for x
    x = 4,426,787,857.67/72,364.78
  6. Step 6: Final answer
    x = 61,173.24

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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.