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Finding the Fourth Proportional to 72,048.80, 108,121.80 and 42,435.20

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Solution

The fourth proportional to 72,048.80, 108,121.80 and 42,435.20 is: 63,681.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,048.80 : 108,121.80 = 42,435.20 : x
  2. Step 2: Convert to fraction form
    72,048.80/108,121.80 = 42,435.20/x
  3. Step 3: Cross multiply
    72,048.80x = 108,121.80 × 42,435.20
  4. Step 4: Simplify right side
    72,048.80x = 4,588,170,207.36
  5. Step 5: Solve for x
    x = 4,588,170,207.36/72,048.80
  6. Step 6: Final answer
    x = 63,681.42

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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.