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Finding the Fourth Proportional to 8,551.40, 12,835.20 and 7,320.20

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Solution

The fourth proportional to 8,551.40, 12,835.20 and 7,320.20 is: 10,987.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,551.40 : 12,835.20 = 7,320.20 : x
  2. Step 2: Convert to fraction form
    8,551.40/12,835.20 = 7,320.20/x
  3. Step 3: Cross multiply
    8,551.40x = 12,835.20 × 7,320.20
  4. Step 4: Simplify right side
    8,551.40x = 93,956,231.04
  5. Step 5: Solve for x
    x = 93,956,231.04/8,551.40
  6. Step 6: Final answer
    x = 10,987.23

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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.