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Finding the Fourth Proportional to 72,143.84, 99,685.68 and 55,520.48

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Solution

The fourth proportional to 72,143.84, 99,685.68 and 55,520.48 is: 76,716.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,143.84 : 99,685.68 = 55,520.48 : x
  2. Step 2: Convert to fraction form
    72,143.84/99,685.68 = 55,520.48/x
  3. Step 3: Cross multiply
    72,143.84x = 99,685.68 × 55,520.48
  4. Step 4: Simplify right side
    72,143.84x = 5,534,596,802.73
  5. Step 5: Solve for x
    x = 5,534,596,802.73/72,143.84
  6. Step 6: Final answer
    x = 76,716.14

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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.