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Finding the Fourth Proportional to 7,015.60, 9,651.72 and 6,821.20

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Solution

The fourth proportional to 7,015.60, 9,651.72 and 6,821.20 is: 9,384.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,015.60 : 9,651.72 = 6,821.20 : x
  2. Step 2: Convert to fraction form
    7,015.60/9,651.72 = 6,821.20/x
  3. Step 3: Cross multiply
    7,015.60x = 9,651.72 × 6,821.20
  4. Step 4: Simplify right side
    7,015.60x = 65,836,312.46
  5. Step 5: Solve for x
    x = 65,836,312.46/7,015.60
  6. Step 6: Final answer
    x = 9,384.27

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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.