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Finding the Fourth Proportional to 72,341.75, 99,806.99 and 42,120.68

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Solution

The fourth proportional to 72,341.75, 99,806.99 and 42,120.68 is: 58,112.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,341.75 : 99,806.99 = 42,120.68 : x
  2. Step 2: Convert to fraction form
    72,341.75/99,806.99 = 42,120.68/x
  3. Step 3: Cross multiply
    72,341.75x = 99,806.99 × 42,120.68
  4. Step 4: Simplify right side
    72,341.75x = 4,203,938,001.98
  5. Step 5: Solve for x
    x = 4,203,938,001.98/72,341.75
  6. Step 6: Final answer
    x = 58,112.19

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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.