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Finding the Fourth Proportional to 8,283.40, 12,389.10 and 7,412.20

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Solution

The fourth proportional to 8,283.40, 12,389.10 and 7,412.20 is: 11,086.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,283.40 : 12,389.10 = 7,412.20 : x
  2. Step 2: Convert to fraction form
    8,283.40/12,389.10 = 7,412.20/x
  3. Step 3: Cross multiply
    8,283.40x = 12,389.10 × 7,412.20
  4. Step 4: Simplify right side
    8,283.40x = 91,830,487.02
  5. Step 5: Solve for x
    x = 91,830,487.02/8,283.40
  6. Step 6: Final answer
    x = 11,086.09

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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.