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Finding the Fourth Proportional to 78,433.88, 108,239.44 and 42,623.89

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Solution

The fourth proportional to 78,433.88, 108,239.44 and 42,623.89 is: 58,821.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,433.88 : 108,239.44 = 42,623.89 : x
  2. Step 2: Convert to fraction form
    78,433.88/108,239.44 = 42,623.89/x
  3. Step 3: Cross multiply
    78,433.88x = 108,239.44 × 42,623.89
  4. Step 4: Simplify right side
    78,433.88x = 4,613,585,686.98
  5. Step 5: Solve for x
    x = 4,613,585,686.98/78,433.88
  6. Step 6: Final answer
    x = 58,821.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.