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Finding the Fourth Proportional to 105,425.70, 145,488.54 and 57,678

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Solution

The fourth proportional to 105,425.70, 145,488.54 and 57,678 is: 79,596.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,425.70 : 145,488.54 = 57,678 : x
  2. Step 2: Convert to fraction form
    105,425.70/145,488.54 = 57,678/x
  3. Step 3: Cross multiply
    105,425.70x = 145,488.54 × 57,678
  4. Step 4: Simplify right side
    105,425.70x = 8,391,488,010.12
  5. Step 5: Solve for x
    x = 8,391,488,010.12/105,425.70
  6. Step 6: Final answer
    x = 79,596.23

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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.