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Finding the Fourth Proportional to 978.28, 1,466.81 and 515.77

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Solution

The fourth proportional to 978.28, 1,466.81 and 515.77 is: 773.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.28 : 1,466.81 = 515.77 : x
  2. Step 2: Convert to fraction form
    978.28/1,466.81 = 515.77/x
  3. Step 3: Cross multiply
    978.28x = 1,466.81 × 515.77
  4. Step 4: Simplify right side
    978.28x = 756,532.28
  5. Step 5: Solve for x
    x = 756,532.28/978.28
  6. Step 6: Final answer
    x = 773.33

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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.