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Finding the Fourth Proportional to 8,564.80, 12,840.42 and 5,621.58

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Solution

The fourth proportional to 8,564.80, 12,840.42 and 5,621.58 is: 8,427.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,564.80 : 12,840.42 = 5,621.58 : x
  2. Step 2: Convert to fraction form
    8,564.80/12,840.42 = 5,621.58/x
  3. Step 3: Cross multiply
    8,564.80x = 12,840.42 × 5,621.58
  4. Step 4: Simplify right side
    8,564.80x = 72,183,448.26
  5. Step 5: Solve for x
    x = 72,183,448.26/8,564.80
  6. Step 6: Final answer
    x = 8,427.92

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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.