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Finding the Fourth Proportional to 72,138.70, 99,551.71 and 39,433.77

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Solution

The fourth proportional to 72,138.70, 99,551.71 and 39,433.77 is: 54,418.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.70 : 99,551.71 = 39,433.77 : x
  2. Step 2: Convert to fraction form
    72,138.70/99,551.71 = 39,433.77/x
  3. Step 3: Cross multiply
    72,138.70x = 99,551.71 × 39,433.77
  4. Step 4: Simplify right side
    72,138.70x = 3,925,699,235.25
  5. Step 5: Solve for x
    x = 3,925,699,235.25/72,138.70
  6. Step 6: Final answer
    x = 54,418.77

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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.