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Finding the Fourth Proportional to 70,528.68, 105,802.89 and 20,612.43

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Solution

The fourth proportional to 70,528.68, 105,802.89 and 20,612.43 is: 30,921.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,528.68 : 105,802.89 = 20,612.43 : x
  2. Step 2: Convert to fraction form
    70,528.68/105,802.89 = 20,612.43/x
  3. Step 3: Cross multiply
    70,528.68x = 105,802.89 × 20,612.43
  4. Step 4: Simplify right side
    70,528.68x = 2,180,854,663.92
  5. Step 5: Solve for x
    x = 2,180,854,663.92/70,528.68
  6. Step 6: Final answer
    x = 30,921.53

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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.