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Finding the Fourth Proportional to 1,563.76, 2,156.88 and 1,065.64

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Solution

The fourth proportional to 1,563.76, 2,156.88 and 1,065.64 is: 1,469.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.76 : 2,156.88 = 1,065.64 : x
  2. Step 2: Convert to fraction form
    1,563.76/2,156.88 = 1,065.64/x
  3. Step 3: Cross multiply
    1,563.76x = 2,156.88 × 1,065.64
  4. Step 4: Simplify right side
    1,563.76x = 2,298,457.60
  5. Step 5: Solve for x
    x = 2,298,457.60/1,563.76
  6. Step 6: Final answer
    x = 1,469.83

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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.