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Finding the Fourth Proportional to 1,567.72, 2,163.54 and 869.08

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Solution

The fourth proportional to 1,567.72, 2,163.54 and 869.08 is: 1,199.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,567.72 : 2,163.54 = 869.08 : x
  2. Step 2: Convert to fraction form
    1,567.72/2,163.54 = 869.08/x
  3. Step 3: Cross multiply
    1,567.72x = 2,163.54 × 869.08
  4. Step 4: Simplify right side
    1,567.72x = 1,880,289.34
  5. Step 5: Solve for x
    x = 1,880,289.34/1,567.72
  6. Step 6: Final answer
    x = 1,199.38

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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.