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Finding the Fourth Proportional to 72,620.29, 100,205.13 and 40,783.06

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Solution

The fourth proportional to 72,620.29, 100,205.13 and 40,783.06 is: 56,274.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,620.29 : 100,205.13 = 40,783.06 : x
  2. Step 2: Convert to fraction form
    72,620.29/100,205.13 = 40,783.06/x
  3. Step 3: Cross multiply
    72,620.29x = 100,205.13 × 40,783.06
  4. Step 4: Simplify right side
    72,620.29x = 4,086,671,829.10
  5. Step 5: Solve for x
    x = 4,086,671,829.10/72,620.29
  6. Step 6: Final answer
    x = 56,274.52

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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.