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Finding the Fourth Proportional to 72,777.10, 100,431.68 and 40,511.20

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Solution

The fourth proportional to 72,777.10, 100,431.68 and 40,511.20 is: 55,905.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,777.10 : 100,431.68 = 40,511.20 : x
  2. Step 2: Convert to fraction form
    72,777.10/100,431.68 = 40,511.20/x
  3. Step 3: Cross multiply
    72,777.10x = 100,431.68 × 40,511.20
  4. Step 4: Simplify right side
    72,777.10x = 4,068,607,874.82
  5. Step 5: Solve for x
    x = 4,068,607,874.82/72,777.10
  6. Step 6: Final answer
    x = 55,905.06

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1.5x scale

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.