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Finding the Fourth Proportional to 1,087.08, 1,628.13 and 653.28

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Solution

The fourth proportional to 1,087.08, 1,628.13 and 653.28 is: 978.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.08 : 1,628.13 = 653.28 : x
  2. Step 2: Convert to fraction form
    1,087.08/1,628.13 = 653.28/x
  3. Step 3: Cross multiply
    1,087.08x = 1,628.13 × 653.28
  4. Step 4: Simplify right side
    1,087.08x = 1,063,624.77
  5. Step 5: Solve for x
    x = 1,063,624.77/1,087.08
  6. Step 6: Final answer
    x = 978.42

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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.