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Finding the Fourth Proportional to 71,901.16, 107,851.28 and 21,981.06

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Solution

The fourth proportional to 71,901.16, 107,851.28 and 21,981.06 is: 32,971.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,901.16 : 107,851.28 = 21,981.06 : x
  2. Step 2: Convert to fraction form
    71,901.16/107,851.28 = 21,981.06/x
  3. Step 3: Cross multiply
    71,901.16x = 107,851.28 × 21,981.06
  4. Step 4: Simplify right side
    71,901.16x = 2,370,685,346.85
  5. Step 5: Solve for x
    x = 2,370,685,346.85/71,901.16
  6. Step 6: Final answer
    x = 32,971.45

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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.