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Finding the Fourth Proportional to 72,789, 100,453.50 and 44,128.32

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Solution

The fourth proportional to 72,789, 100,453.50 and 44,128.32 is: 60,899.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,789 : 100,453.50 = 44,128.32 : x
  2. Step 2: Convert to fraction form
    72,789/100,453.50 = 44,128.32/x
  3. Step 3: Cross multiply
    72,789x = 100,453.50 × 44,128.32
  4. Step 4: Simplify right side
    72,789x = 4,432,844,193.12
  5. Step 5: Solve for x
    x = 4,432,844,193.12/72,789
  6. Step 6: Final answer
    x = 60,899.92

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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.