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Finding the Fourth Proportional to 1,315.89, 1,973.61 and 450

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Solution

The fourth proportional to 1,315.89, 1,973.61 and 450 is: 674.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.89 : 1,973.61 = 450 : x
  2. Step 2: Convert to fraction form
    1,315.89/1,973.61 = 450/x
  3. Step 3: Cross multiply
    1,315.89x = 1,973.61 × 450
  4. Step 4: Simplify right side
    1,315.89x = 888,124.50
  5. Step 5: Solve for x
    x = 888,124.50/1,315.89
  6. Step 6: Final answer
    x = 674.92

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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.