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Finding the Fourth Proportional to 6,638.72, 9,921.85 and 6,113.30

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Solution

The fourth proportional to 6,638.72, 9,921.85 and 6,113.30 is: 9,136.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,638.72 : 9,921.85 = 6,113.30 : x
  2. Step 2: Convert to fraction form
    6,638.72/9,921.85 = 6,113.30/x
  3. Step 3: Cross multiply
    6,638.72x = 9,921.85 × 6,113.30
  4. Step 4: Simplify right side
    6,638.72x = 60,655,180.71
  5. Step 5: Solve for x
    x = 60,655,180.71/6,638.72
  6. Step 6: Final answer
    x = 9,136.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.