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Finding the Fourth Proportional to 72,888.16, 100,586.72 and 40,621.88

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Solution

The fourth proportional to 72,888.16, 100,586.72 and 40,621.88 is: 56,058.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,888.16 : 100,586.72 = 40,621.88 : x
  2. Step 2: Convert to fraction form
    72,888.16/100,586.72 = 40,621.88/x
  3. Step 3: Cross multiply
    72,888.16x = 100,586.72 × 40,621.88
  4. Step 4: Simplify right side
    72,888.16x = 4,086,021,669.43
  5. Step 5: Solve for x
    x = 4,086,021,669.43/72,888.16
  6. Step 6: Final answer
    x = 56,058.78

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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.