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Finding the Fourth Proportional to 289,108.80, 433,663.20 and 102,139.20

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Solution

The fourth proportional to 289,108.80, 433,663.20 and 102,139.20 is: 153,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,108.80 : 433,663.20 = 102,139.20 : x
  2. Step 2: Convert to fraction form
    289,108.80/433,663.20 = 102,139.20/x
  3. Step 3: Cross multiply
    289,108.80x = 433,663.20 × 102,139.20
  4. Step 4: Simplify right side
    289,108.80x = 44,294,012,317.44
  5. Step 5: Solve for x
    x = 44,294,012,317.44/289,108.80
  6. Step 6: Final answer
    x = 153,208.80

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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.