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Finding the Fourth Proportional to 72,778.68, 100,435.50 and 40,947.64

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Solution

The fourth proportional to 72,778.68, 100,435.50 and 40,947.64 is: 56,508.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,778.68 : 100,435.50 = 40,947.64 : x
  2. Step 2: Convert to fraction form
    72,778.68/100,435.50 = 40,947.64/x
  3. Step 3: Cross multiply
    72,778.68x = 100,435.50 × 40,947.64
  4. Step 4: Simplify right side
    72,778.68x = 4,112,596,697.22
  5. Step 5: Solve for x
    x = 4,112,596,697.22/72,778.68
  6. Step 6: Final answer
    x = 56,508.26

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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.