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Finding the Fourth Proportional to 105,426, 158,139 and 31,554

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Solution

The fourth proportional to 105,426, 158,139 and 31,554 is: 47,331

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,426 : 158,139 = 31,554 : x
  2. Step 2: Convert to fraction form
    105,426/158,139 = 31,554/x
  3. Step 3: Cross multiply
    105,426x = 158,139 × 31,554
  4. Step 4: Simplify right side
    105,426x = 4,989,918,006
  5. Step 5: Solve for x
    x = 4,989,918,006/105,426
  6. Step 6: Final answer
    x = 47,331

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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.