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Finding the Fourth Proportional to 70,387.16, 105,591.03 and 20,460.77

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Solution

The fourth proportional to 70,387.16, 105,591.03 and 20,460.77 is: 30,694.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,387.16 : 105,591.03 = 20,460.77 : x
  2. Step 2: Convert to fraction form
    70,387.16/105,591.03 = 20,460.77/x
  3. Step 3: Cross multiply
    70,387.16x = 105,591.03 × 20,460.77
  4. Step 4: Simplify right side
    70,387.16x = 2,160,473,723.63
  5. Step 5: Solve for x
    x = 2,160,473,723.63/70,387.16
  6. Step 6: Final answer
    x = 30,694.15

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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.