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Finding the Fourth Proportional to 79,784.80, 119,648.40 and 40,328.80

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Solution

The fourth proportional to 79,784.80, 119,648.40 and 40,328.80 is: 60,478.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,784.80 : 119,648.40 = 40,328.80 : x
  2. Step 2: Convert to fraction form
    79,784.80/119,648.40 = 40,328.80/x
  3. Step 3: Cross multiply
    79,784.80x = 119,648.40 × 40,328.80
  4. Step 4: Simplify right side
    79,784.80x = 4,825,276,393.92
  5. Step 5: Solve for x
    x = 4,825,276,393.92/79,784.80
  6. Step 6: Final answer
    x = 60,478.64

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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.