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Finding the Fourth Proportional to 72,930.66, 100,643.72 and 40,664.90

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Solution

The fourth proportional to 72,930.66, 100,643.72 and 40,664.90 is: 56,117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.66 : 100,643.72 = 40,664.90 : x
  2. Step 2: Convert to fraction form
    72,930.66/100,643.72 = 40,664.90/x
  3. Step 3: Cross multiply
    72,930.66x = 100,643.72 × 40,664.90
  4. Step 4: Simplify right side
    72,930.66x = 4,092,666,102.88
  5. Step 5: Solve for x
    x = 4,092,666,102.88/72,930.66
  6. Step 6: Final answer
    x = 56,117.22

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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.