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Finding the Fourth Proportional to 1,065.28, 1,469.64 and 715.36

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Solution

The fourth proportional to 1,065.28, 1,469.64 and 715.36 is: 986.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.28 : 1,469.64 = 715.36 : x
  2. Step 2: Convert to fraction form
    1,065.28/1,469.64 = 715.36/x
  3. Step 3: Cross multiply
    1,065.28x = 1,469.64 × 715.36
  4. Step 4: Simplify right side
    1,065.28x = 1,051,321.67
  5. Step 5: Solve for x
    x = 1,051,321.67/1,065.28
  6. Step 6: Final answer
    x = 986.90

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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.