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Finding the Fourth Proportional to 386,447.20, 579,670.80 and 102,137.20

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Solution

The fourth proportional to 386,447.20, 579,670.80 and 102,137.20 is: 153,205.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,447.20 : 579,670.80 = 102,137.20 : x
  2. Step 2: Convert to fraction form
    386,447.20/579,670.80 = 102,137.20/x
  3. Step 3: Cross multiply
    386,447.20x = 579,670.80 × 102,137.20
  4. Step 4: Simplify right side
    386,447.20x = 59,205,952,433.76
  5. Step 5: Solve for x
    x = 59,205,952,433.76/386,447.20
  6. Step 6: Final answer
    x = 153,205.80

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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.