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Finding the Fourth Proportional to 72,478.80, 108,631.80 and 30,358.80

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Solution

The fourth proportional to 72,478.80, 108,631.80 and 30,358.80 is: 45,502.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,478.80 : 108,631.80 = 30,358.80 : x
  2. Step 2: Convert to fraction form
    72,478.80/108,631.80 = 30,358.80/x
  3. Step 3: Cross multiply
    72,478.80x = 108,631.80 × 30,358.80
  4. Step 4: Simplify right side
    72,478.80x = 3,297,931,089.84
  5. Step 5: Solve for x
    x = 3,297,931,089.84/72,478.80
  6. Step 6: Final answer
    x = 45,502.01

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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.