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Finding the Fourth Proportional to 72,443.70, 108,629.10 and 42,870.60

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Solution

The fourth proportional to 72,443.70, 108,629.10 and 42,870.60 is: 64,284.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,443.70 : 108,629.10 = 42,870.60 : x
  2. Step 2: Convert to fraction form
    72,443.70/108,629.10 = 42,870.60/x
  3. Step 3: Cross multiply
    72,443.70x = 108,629.10 × 42,870.60
  4. Step 4: Simplify right side
    72,443.70x = 4,656,994,694.46
  5. Step 5: Solve for x
    x = 4,656,994,694.46/72,443.70
  6. Step 6: Final answer
    x = 64,284.33

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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.