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Finding the Fourth Proportional to 72,435.48, 108,629.88 and 67,712.76

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Solution

The fourth proportional to 72,435.48, 108,629.88 and 67,712.76 is: 101,547.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,435.48 : 108,629.88 = 67,712.76 : x
  2. Step 2: Convert to fraction form
    72,435.48/108,629.88 = 67,712.76/x
  3. Step 3: Cross multiply
    72,435.48x = 108,629.88 × 67,712.76
  4. Step 4: Simplify right side
    72,435.48x = 7,355,628,993.27
  5. Step 5: Solve for x
    x = 7,355,628,993.27/72,435.48
  6. Step 6: Final answer
    x = 101,547.32

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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.