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Finding the Fourth Proportional to 72,643.10, 100,237.10 and 40,375.53

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Solution

The fourth proportional to 72,643.10, 100,237.10 and 40,375.53 is: 55,712.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,643.10 : 100,237.10 = 40,375.53 : x
  2. Step 2: Convert to fraction form
    72,643.10/100,237.10 = 40,375.53/x
  3. Step 3: Cross multiply
    72,643.10x = 100,237.10 × 40,375.53
  4. Step 4: Simplify right side
    72,643.10x = 4,047,125,836.29
  5. Step 5: Solve for x
    x = 4,047,125,836.29/72,643.10
  6. Step 6: Final answer
    x = 55,712.46

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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.