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Finding the Fourth Proportional to 70,431.72, 96,990.96 and 65,929.20

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Solution

The fourth proportional to 70,431.72, 96,990.96 and 65,929.20 is: 90,790.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,431.72 : 96,990.96 = 65,929.20 : x
  2. Step 2: Convert to fraction form
    70,431.72/96,990.96 = 65,929.20/x
  3. Step 3: Cross multiply
    70,431.72x = 96,990.96 × 65,929.20
  4. Step 4: Simplify right side
    70,431.72x = 6,394,536,400.03
  5. Step 5: Solve for x
    x = 6,394,536,400.03/70,431.72
  6. Step 6: Final answer
    x = 90,790.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.