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Finding the Fourth Proportional to 72,985.85, 100,720.42 and 39,451.85

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Solution

The fourth proportional to 72,985.85, 100,720.42 and 39,451.85 is: 54,443.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,985.85 : 100,720.42 = 39,451.85 : x
  2. Step 2: Convert to fraction form
    72,985.85/100,720.42 = 39,451.85/x
  3. Step 3: Cross multiply
    72,985.85x = 100,720.42 × 39,451.85
  4. Step 4: Simplify right side
    72,985.85x = 3,973,606,901.78
  5. Step 5: Solve for x
    x = 3,973,606,901.78/72,985.85
  6. Step 6: Final answer
    x = 54,443.52

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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.