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Finding the Fourth Proportional to 8,386.80, 12,563.40 and 5,257.20

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Solution

The fourth proportional to 8,386.80, 12,563.40 and 5,257.20 is: 7,875.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,386.80 : 12,563.40 = 5,257.20 : x
  2. Step 2: Convert to fraction form
    8,386.80/12,563.40 = 5,257.20/x
  3. Step 3: Cross multiply
    8,386.80x = 12,563.40 × 5,257.20
  4. Step 4: Simplify right side
    8,386.80x = 66,048,306.48
  5. Step 5: Solve for x
    x = 66,048,306.48/8,386.80
  6. Step 6: Final answer
    x = 7,875.27

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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.