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Finding the Fourth Proportional to 72,405.84, 108,607.68 and 19,815.24

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Solution

The fourth proportional to 72,405.84, 108,607.68 and 19,815.24 is: 29,722.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.84 : 108,607.68 = 19,815.24 : x
  2. Step 2: Convert to fraction form
    72,405.84/108,607.68 = 19,815.24/x
  3. Step 3: Cross multiply
    72,405.84x = 108,607.68 × 19,815.24
  4. Step 4: Simplify right side
    72,405.84x = 2,152,087,245.04
  5. Step 5: Solve for x
    x = 2,152,087,245.04/72,405.84
  6. Step 6: Final answer
    x = 29,722.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.