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Finding the Fourth Proportional to 72,702.36, 100,338.30 and 40,871.30

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Solution

The fourth proportional to 72,702.36, 100,338.30 and 40,871.30 is: 56,407.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,702.36 : 100,338.30 = 40,871.30 : x
  2. Step 2: Convert to fraction form
    72,702.36/100,338.30 = 40,871.30/x
  3. Step 3: Cross multiply
    72,702.36x = 100,338.30 × 40,871.30
  4. Step 4: Simplify right side
    72,702.36x = 4,100,956,259.10
  5. Step 5: Solve for x
    x = 4,100,956,259.10/72,702.36
  6. Step 6: Final answer
    x = 56,407.47

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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.