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Finding the Fourth Proportional to 72,419.70, 108,629.55 and 65,421.30

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Solution

The fourth proportional to 72,419.70, 108,629.55 and 65,421.30 is: 98,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,419.70 : 108,629.55 = 65,421.30 : x
  2. Step 2: Convert to fraction form
    72,419.70/108,629.55 = 65,421.30/x
  3. Step 3: Cross multiply
    72,419.70x = 108,629.55 × 65,421.30
  4. Step 4: Simplify right side
    72,419.70x = 7,106,686,379.42
  5. Step 5: Solve for x
    x = 7,106,686,379.42/72,419.70
  6. Step 6: Final answer
    x = 98,131.95

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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.