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Finding the Fourth Proportional to 70,671.88, 105,981.90 and 20,739.16

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Solution

The fourth proportional to 70,671.88, 105,981.90 and 20,739.16 is: 31,101.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,671.88 : 105,981.90 = 20,739.16 : x
  2. Step 2: Convert to fraction form
    70,671.88/105,981.90 = 20,739.16/x
  3. Step 3: Cross multiply
    70,671.88x = 105,981.90 × 20,739.16
  4. Step 4: Simplify right side
    70,671.88x = 2,197,975,581.20
  5. Step 5: Solve for x
    x = 2,197,975,581.20/70,671.88
  6. Step 6: Final answer
    x = 31,101.13

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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.