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Finding the Fourth Proportional to 8,320.60, 12,480.90 and 4,821.40

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Solution

The fourth proportional to 8,320.60, 12,480.90 and 4,821.40 is: 7,232.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,320.60 : 12,480.90 = 4,821.40 : x
  2. Step 2: Convert to fraction form
    8,320.60/12,480.90 = 4,821.40/x
  3. Step 3: Cross multiply
    8,320.60x = 12,480.90 × 4,821.40
  4. Step 4: Simplify right side
    8,320.60x = 60,175,411.26
  5. Step 5: Solve for x
    x = 60,175,411.26/8,320.60
  6. Step 6: Final answer
    x = 7,232.10

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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.