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Finding the Fourth Proportional to 258,374.70, 387,569.61 and 71,386.38

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Solution

The fourth proportional to 258,374.70, 387,569.61 and 71,386.38 is: 107,081.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,374.70 : 387,569.61 = 71,386.38 : x
  2. Step 2: Convert to fraction form
    258,374.70/387,569.61 = 71,386.38/x
  3. Step 3: Cross multiply
    258,374.70x = 387,569.61 × 71,386.38
  4. Step 4: Simplify right side
    258,374.70x = 27,667,191,455.91
  5. Step 5: Solve for x
    x = 27,667,191,455.91/258,374.70
  6. Step 6: Final answer
    x = 107,081.66

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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.