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Finding the Fourth Proportional to 399,636.80, 599,455.20 and 104,148.80

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Solution

The fourth proportional to 399,636.80, 599,455.20 and 104,148.80 is: 156,223.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,636.80 : 599,455.20 = 104,148.80 : x
  2. Step 2: Convert to fraction form
    399,636.80/599,455.20 = 104,148.80/x
  3. Step 3: Cross multiply
    399,636.80x = 599,455.20 × 104,148.80
  4. Step 4: Simplify right side
    399,636.80x = 62,432,539,733.76
  5. Step 5: Solve for x
    x = 62,432,539,733.76/399,636.80
  6. Step 6: Final answer
    x = 156,223.20

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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.