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Finding the Fourth Proportional to 70,688.64, 106,010.76 and 20,756.28

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Solution

The fourth proportional to 70,688.64, 106,010.76 and 20,756.28 is: 31,127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,688.64 : 106,010.76 = 20,756.28 : x
  2. Step 2: Convert to fraction form
    70,688.64/106,010.76 = 20,756.28/x
  3. Step 3: Cross multiply
    70,688.64x = 106,010.76 × 20,756.28
  4. Step 4: Simplify right side
    70,688.64x = 2,200,389,017.57
  5. Step 5: Solve for x
    x = 2,200,389,017.57/70,688.64
  6. Step 6: Final answer
    x = 31,127.90

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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.