Home / 8,688.72-11,989.68-5,151.36

Finding the Fourth Proportional to 8,688.72, 11,989.68 and 5,151.36

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Solution

The fourth proportional to 8,688.72, 11,989.68 and 5,151.36 is: 7,108.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.72 : 11,989.68 = 5,151.36 : x
  2. Step 2: Convert to fraction form
    8,688.72/11,989.68 = 5,151.36/x
  3. Step 3: Cross multiply
    8,688.72x = 11,989.68 × 5,151.36
  4. Step 4: Simplify right side
    8,688.72x = 61,763,157.96
  5. Step 5: Solve for x
    x = 61,763,157.96/8,688.72
  6. Step 6: Final answer
    x = 7,108.43

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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.