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Finding the Fourth Proportional to 72,210.46, 99,650.64 and 40,379.89

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Solution

The fourth proportional to 72,210.46, 99,650.64 and 40,379.89 is: 55,724.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,210.46 : 99,650.64 = 40,379.89 : x
  2. Step 2: Convert to fraction form
    72,210.46/99,650.64 = 40,379.89/x
  3. Step 3: Cross multiply
    72,210.46x = 99,650.64 × 40,379.89
  4. Step 4: Simplify right side
    72,210.46x = 4,023,881,881.63
  5. Step 5: Solve for x
    x = 4,023,881,881.63/72,210.46
  6. Step 6: Final answer
    x = 55,724.36

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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.