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Finding the Fourth Proportional to 1,776.99, 2,665.17 and 478.59

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Solution

The fourth proportional to 1,776.99, 2,665.17 and 478.59 is: 717.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.99 : 2,665.17 = 478.59 : x
  2. Step 2: Convert to fraction form
    1,776.99/2,665.17 = 478.59/x
  3. Step 3: Cross multiply
    1,776.99x = 2,665.17 × 478.59
  4. Step 4: Simplify right side
    1,776.99x = 1,275,523.71
  5. Step 5: Solve for x
    x = 1,275,523.71/1,776.99
  6. Step 6: Final answer
    x = 717.80

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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.