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Finding the Fourth Proportional to 1,325.28, 1,989.12 and 709.48

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Solution

The fourth proportional to 1,325.28, 1,989.12 and 709.48 is: 1,064.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.28 : 1,989.12 = 709.48 : x
  2. Step 2: Convert to fraction form
    1,325.28/1,989.12 = 709.48/x
  3. Step 3: Cross multiply
    1,325.28x = 1,989.12 × 709.48
  4. Step 4: Simplify right side
    1,325.28x = 1,411,240.86
  5. Step 5: Solve for x
    x = 1,411,240.86/1,325.28
  6. Step 6: Final answer
    x = 1,064.86

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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.