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Finding the Fourth Proportional to 9,113.20, 13,669.80 and 8,220.40

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Solution

The fourth proportional to 9,113.20, 13,669.80 and 8,220.40 is: 12,330.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,113.20 : 13,669.80 = 8,220.40 : x
  2. Step 2: Convert to fraction form
    9,113.20/13,669.80 = 8,220.40/x
  3. Step 3: Cross multiply
    9,113.20x = 13,669.80 × 8,220.40
  4. Step 4: Simplify right side
    9,113.20x = 112,371,223.92
  5. Step 5: Solve for x
    x = 112,371,223.92/9,113.20
  6. Step 6: Final answer
    x = 12,330.60

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1.5x scale

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.