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Finding the Fourth Proportional to 105,321, 157,981.50 and 31,449

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Solution

The fourth proportional to 105,321, 157,981.50 and 31,449 is: 47,173.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,321 : 157,981.50 = 31,449 : x
  2. Step 2: Convert to fraction form
    105,321/157,981.50 = 31,449/x
  3. Step 3: Cross multiply
    105,321x = 157,981.50 × 31,449
  4. Step 4: Simplify right side
    105,321x = 4,968,360,193.50
  5. Step 5: Solve for x
    x = 4,968,360,193.50/105,321
  6. Step 6: Final answer
    x = 47,173.50

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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.